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Class 10 Mathematics - Quadratic Equations - Methods of Solving Quadratic Equations Expert Quiz

Level 34 • 50/50 questions • 25 seconds per question.

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\(14x^2-25x+6=0\) को गुणनखंड विधि से हल करने पर मूल क्या होंगे?

What will be the roots of \(14x^2-25x+6=0\) by factorisation method?

Explanation opens after your attempt
Correct Answer

A. \(x=\frac{3}{7},1\)

Step 1

Concept

(14x-2-25x+6=(7x-3)(2x-2)), so the roots are \(\frac{3}{7}\) and (1). In exams, also check by removing any common factor if present.

Step 2

Why this answer is correct

The correct answer is A. \(x=\frac{3}{7},1\). (14x-2-25x+6=(7x-3)(2x-2)), so the roots are \(\frac{3}{7}\) and (1). In exams, also check by removing any common factor if present.

Step 3

Exam Tip

(14x-2-25x+6=(7x-3)(2x-2)), इसलिए मूल \(\frac{3}{7}\) और (1) हैं। परीक्षा में पहले सामान्य गुणक हो तो उसे हटाकर भी जांचें।

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\(20x^2-43x+21=0\) में मध्य पद का सही विभाजन कौनसा है?

What is the correct splitting of the middle term in \(20x^2-43x+21=0\)?

Explanation opens after your attempt
Correct Answer

A. \(20x^2-28x-15x+21=0\)

Step 1

Concept

Here (ac=420) and (-28+(-15)=-43), so the correct split is (-28x-15x). In exams, even when (ac) is large, match both sum and product.

Step 2

Why this answer is correct

The correct answer is A. \(20x^2-28x-15x+21=0\). Here (ac=420) and (-28+(-15)=-43), so the correct split is (-28x-15x). In exams, even when (ac) is large, match both sum and product.

Step 3

Exam Tip

यहां (ac=420) और (-28+(-15)=-43), इसलिए सही विभाजन (-28x-15x) है। परीक्षा में (ac) बड़ा हो तो भी योग और गुणनफल दोनों मिलाएं।

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\(20x^2-43x+21=0\) के मूल क्या हैं?

What are the roots of \(20x^2-43x+21=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=\frac{7}{5},\frac{3}{4}\)

Step 1

Concept

(20x-2-43x+21=(5x-7)(4x-3)), so the roots are \(\frac{7}{5}\) and \(\frac{3}{4}\). In exams, do not invert fractional roots.

Step 2

Why this answer is correct

The correct answer is A. \(x=\frac{7}{5},\frac{3}{4}\). (20x-2-43x+21=(5x-7)(4x-3)), so the roots are \(\frac{7}{5}\) and \(\frac{3}{4}\). In exams, do not invert fractional roots.

Step 3

Exam Tip

(20x-2-43x+21=(5x-7)(4x-3)), इसलिए मूल \(\frac{7}{5}\) और \(\frac{3}{4}\) हैं। परीक्षा में भिन्न मूलों को उल्टा न लिखें।

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यदि (x-2-2(k+3)x+k-2-16=0) के मूल समान हों, तो (k) का मान क्या होगा?

If (x-2-2(k+3)x+k-2-16=0) has equal roots, what is the value of (k)?

Explanation opens after your attempt
Correct Answer

A. \(k=\frac{7}{6}\)

Step 1

Concept

For equal roots, (D=0), so (4(k+3)2-4\(k^2-16\)=0) must be expanded carefully; a wrong expansion changes the answer. In exams, recheck parameter expansion.

Step 2

Why this answer is correct

The correct answer is A. \(k=\frac{7}{6}\). For equal roots, (D=0), so (4(k+3)2-4\(k^2-16\)=0) must be expanded carefully; a wrong expansion changes the answer. In exams, recheck parameter expansion.

Step 3

Exam Tip

समान मूलों के लिए (D=0), इसलिए (4(k+3)2-4\(k^2-16\)=0) से (6k+25=0) नहीं बल्कि (6k+25) गलत होगा; सही फैलाने पर (6k+25) नहीं बनता। परीक्षा में विस्तार दोबारा जांचें।

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यदि (x-2-2(k+3)x+k-2-16=0) के समान मूलों के लिए सही (k) चाहिए, तो कौनसा मान सही है?

If the correct (k) is needed for equal roots of (x-2-2(k+3)x+k-2-16=0), which value is correct?

Explanation opens after your attempt
Correct Answer

B. \(k=-\frac{25}{6}\)

Step 1

Concept

(D=4(k+3)2-4\(k^2-16\)=0) gives ((k+3)2=k-2-16), so (6k+25=0) and \(k=-\frac{25}{6}\). In exams, handle the constant term carefully after expansion.

Step 2

Why this answer is correct

The correct answer is B. \(k=-\frac{25}{6}\). (D=4(k+3)2-4\(k^2-16\)=0) gives ((k+3)2=k-2-16), so (6k+25=0) and \(k=-\frac{25}{6}\). In exams, handle the constant term carefully after expansion.

Step 3

Exam Tip

(D=4(k+3)2-4\(k^2-16\)=0) से ((k+3)2=k-2-16), इसलिए (6k+25=0) और \(k=-\frac{25}{6}\) है। परीक्षा में विस्तार के बाद स्थिर पद ध्यान से जोड़ें।

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यदि (5x-2-(p+4)x+20=0) के मूल (2) और (2) हैं, तो (p) क्या होगा?

If the roots of (5x-2-(p+4)x+20=0) are (2) and (2), what is (p)?

Explanation opens after your attempt
Correct Answer

A. (p=16)

Step 1

Concept

The sum of roots is (4), and \(\frac{p+4}{5}=4\), so (p=16). In exams, use \(-\frac{b}{a}\) for the sum.

Step 2

Why this answer is correct

The correct answer is A. (p=16). The sum of roots is (4), and \(\frac{p+4}{5}=4\), so (p=16). In exams, use \(-\frac{b}{a}\) for the sum.

Step 3

Exam Tip

मूलों का योग (4) है और \(\frac{p+4}{5}=4\), इसलिए (p=16) है। परीक्षा में \(-\frac{b}{a}\) से योग निकालें।

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\(9x^2-30x+8=0\) को पूर्ण वर्ग विधि से हल करने में सही मध्य चरण कौनसा है?

Which middle step is correct while solving \(9x^2-30x+8=0\) by completing the square?

Explanation opens after your attempt
Correct Answer

A. (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9})

Step 1

Concept

First \(x^2-\frac{10}{3}x+\frac{8}{9}=0\) is obtained, then (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}). In exams, divide by (a) first when \(a\neq1\).

Step 2

Why this answer is correct

The correct answer is A. (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}). First \(x^2-\frac{10}{3}x+\frac{8}{9}=0\) is obtained, then (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}). In exams, divide by (a) first when \(a\neq1\).

Step 3

Exam Tip

पहले \(x^2-\frac{10}{3}x+\frac{8}{9}=0\) बनता है, फिर (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}) मिलता है। परीक्षा में \(a\neq1\) हो तो पहले (a) से भाग दें।

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\(9x^2-30x+8=0\) के मूल पूर्ण वर्ग विधि से क्या होंगे?

What roots are obtained for \(9x^2-30x+8=0\) by completing square method?

Explanation opens after your attempt
Correct Answer

A. \(x=\frac{5\pm\sqrt{17}}{3}\)

Step 1

Concept

Since (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}), \(x=\frac{5\pm\sqrt{17}}{3}\). In exams, write the square root with the denominator correctly.

Step 2

Why this answer is correct

The correct answer is A. \(x=\frac{5\pm\sqrt{17}}{3}\). Since (\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}), \(x=\frac{5\pm\sqrt{17}}{3}\). In exams, write the square root with the denominator correctly.

Step 3

Exam Tip

(\left\(x-\frac{5}{3}\right\)2=\frac{17}{9}), इसलिए \(x=\frac{5\pm\sqrt{17}}{3}\) है। परीक्षा में वर्गमूल को हर के साथ सही लिखें।

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यदि \(x^2-20x+m=0\) के मूल वास्तविक और समान हैं, तो (m) का मान क्या है?

If \(x^2-20x+m=0\) has real and equal roots, what is the value of (m)?

Explanation opens after your attempt
Correct Answer

A. (m=100)

Step 1

Concept

For real and equal roots, (D=0), so (400-4m=0) gives (m=100). In exams, equal roots indicate (D=0).

Step 2

Why this answer is correct

The correct answer is A. (m=100). For real and equal roots, (D=0), so (400-4m=0) gives (m=100). In exams, equal roots indicate (D=0).

Step 3

Exam Tip

समान वास्तविक मूलों के लिए (D=0), इसलिए (400-4m=0) से (m=100) है। परीक्षा में समान मूल का संकेत (D=0) होता है।

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\(6x^2-19x+15=0\) और \(10x^2-27x+18=0\) में कौनसा मूल समान है?

Which root is common to \(6x^2-19x+15=0\) and \(10x^2-27x+18=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=\frac{3}{2}\)

Step 1

Concept

The first equation has roots \(\frac{3}{2},\frac{5}{3}\), and the second has roots \(\frac{3}{2},\frac{6}{5}\). In exams, solve both equations separately for the common root.

Step 2

Why this answer is correct

The correct answer is A. \(x=\frac{3}{2}\). The first equation has roots \(\frac{3}{2},\frac{5}{3}\), and the second has roots \(\frac{3}{2},\frac{6}{5}\). In exams, solve both equations separately for the common root.

Step 3

Exam Tip

पहले समीकरण के मूल \(\frac{3}{2},\frac{5}{3}\) और दूसरे के मूल \(\frac{3}{2},\frac{6}{5}\) हैं। परीक्षा में समान मूल के लिए दोनों समीकरण अलग हल करें।

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यदि \(x^2-21x+q=0\) का एक मूल (8) है, तो दूसरा मूल क्या होगा?

If one root of \(x^2-21x+q=0\) is (8), what will be the other root?

Explanation opens after your attempt
Correct Answer

A. (13)

Step 1

Concept

The sum of roots is (21), so the other root is (21-8=13). In exams, use the sum when one root is given.

Step 2

Why this answer is correct

The correct answer is A. (13). The sum of roots is (21), so the other root is (21-8=13). In exams, use the sum when one root is given.

Step 3

Exam Tip

मूलों का योग (21) है, इसलिए दूसरा मूल (21-8=13) होगा। परीक्षा में एक मूल दिया हो तो योग का उपयोग करें।

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यदि \(x^2-21x+q=0\) का एक मूल (8) है, तो (q) का मान क्या होगा?

If one root of \(x^2-21x+q=0\) is (8), what is the value of (q)?

Explanation opens after your attempt
Correct Answer

A. (104)

Step 1

Concept

The other root is (13), so \(q=8\times13=104\). In exams, when (a=1), the constant term is the product of roots.

Step 2

Why this answer is correct

The correct answer is A. (104). The other root is (13), so \(q=8\times13=104\). In exams, when (a=1), the constant term is the product of roots.

Step 3

Exam Tip

दूसरा मूल (13) है, इसलिए \(q=8\times13=104\) होगा। परीक्षा में (a=1) हो तो स्थिर पद मूलों का गुणनफल होता है।

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\(6x^2+x-2=0\) में एक छात्र ने \(x=\frac{1}{2},-\frac{2}{3}\) लिखा है। यह उत्तर कैसा है?

A student wrote \(x=\frac{1}{2},-\frac{2}{3}\) for \(6x^2+x-2=0\). How is this answer?

Explanation opens after your attempt
Correct Answer

A. सही हैCorrect

Step 1

Concept

(6x-2+x-2=(3x+2)(2x-1)), so \(x=\frac{1}{2},-\frac{2}{3}\) is correct. In exams, change signs carefully from factors.

Step 2

Why this answer is correct

The correct answer is A. सही है / Correct. (6x-2+x-2=(3x+2)(2x-1)), so \(x=\frac{1}{2},-\frac{2}{3}\) is correct. In exams, change signs carefully from factors.

Step 3

Exam Tip

(6x-2+x-2=(3x+2)(2x-1)), इसलिए \(x=\frac{1}{2},-\frac{2}{3}\) सही है। परीक्षा में गुणनखंडों से संकेत सावधानी से बदलें।

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\(x^2-2\sqrt{11}x+11=0\) को किस रूप में लिखा जा सकता है?

In which form can \(x^2-2\sqrt{11}x+11=0\) be written?

Explanation opens after your attempt
Correct Answer

A. (\(x-\sqrt{11}\)2=0)

Step 1

Concept

Since (11=\(\sqrt{11}\)2) and the middle term is \(-2\sqrt{11}x\), it is (\(x-\sqrt{11}\)2). In exams, identify perfect squares even with irrational coefficients.

Step 2

Why this answer is correct

The correct answer is A. (\(x-\sqrt{11}\)2=0). Since (11=\(\sqrt{11}\)2) and the middle term is \(-2\sqrt{11}x\), it is (\(x-\sqrt{11}\)2). In exams, identify perfect squares even with irrational coefficients.

Step 3

Exam Tip

क्योंकि (11=\(\sqrt{11}\)2) और मध्य पद \(-2\sqrt{11}x\) है, इसलिए यह (\(x-\sqrt{11}\)2) है। परीक्षा में अपरिमेय गुणांक में भी पूर्ण वर्ग पहचानें।

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\(x^2-2\sqrt{11}x+11=0\) का मूल क्या है?

What is the root of \(x^2-2\sqrt{11}x+11=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=\sqrt{11}\)

Step 1

Concept

(\(x-\sqrt{11}\)2=0), so the repeated root is \(\sqrt{11}\). In exams, ((x-a)2=0) gives (x=a).

Step 2

Why this answer is correct

The correct answer is A. \(x=\sqrt{11}\). (\(x-\sqrt{11}\)2=0), so the repeated root is \(\sqrt{11}\). In exams, ((x-a)2=0) gives (x=a).

Step 3

Exam Tip

(\(x-\sqrt{11}\)2=0), इसलिए दोहराया हुआ मूल \(\sqrt{11}\) है। परीक्षा में ((x-a)2=0) से (x=a) मिलता है।

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(x-2-(r+t)x+rt=0) के मूल कौनसे हैं?

What are the roots of (x-2-(r+t)x+rt=0)?

Explanation opens after your attempt
Correct Answer

A. (x=r,t)

Step 1

Concept

The equation is equivalent to ((x-r)(x-t)=0), so the roots are (r) and (t). In exams, apply zero product rule to symbolic factors too.

Step 2

Why this answer is correct

The correct answer is A. (x=r,t). The equation is equivalent to ((x-r)(x-t)=0), so the roots are (r) and (t). In exams, apply zero product rule to symbolic factors too.

Step 3

Exam Tip

यह समीकरण ((x-r)(x-t)=0) के बराबर है, इसलिए मूल (r) और (t) हैं। परीक्षा में प्रतीकात्मक गुणनखंडों पर भी शून्य गुणनफल नियम लगाएं।

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यदि \(x^2-2cx+c^2-d^2=0\), तो इसके मूल कौनसे हैं?

If \(x^2-2cx+c^2-d^2=0\), what are its roots?

Explanation opens after your attempt
Correct Answer

A. (x=c+d,c-d)

Step 1

Concept

It is ((x-c)2-d-2=0), so \(x-c=\pm d\) and \(x=c\pm d\). In exams, quickly recognize the difference of squares.

Step 2

Why this answer is correct

The correct answer is A. (x=c+d,c-d). It is ((x-c)2-d-2=0), so \(x-c=\pm d\) and \(x=c\pm d\). In exams, quickly recognize the difference of squares.

Step 3

Exam Tip

यह ((x-c)2-d-2=0) है, इसलिए \(x-c=\pm d\) और \(x=c\pm d\) हैं। परीक्षा में वर्गों के अंतर को जल्दी पहचानें।

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(25x-2-25(a+b)x+25ab=0) को सरल करने के बाद मूल क्या होंगे?

After simplifying (25x-2-25(a+b)x+25ab=0), what will be the roots?

Explanation opens after your attempt
Correct Answer

A. (x=a,b)

Step 1

Concept

Dividing the whole equation by (25) gives (x-2-(a+b)x+ab=0). In exams, removing the common factor first shortens the solution.

Step 2

Why this answer is correct

The correct answer is A. (x=a,b). Dividing the whole equation by (25) gives (x-2-(a+b)x+ab=0). In exams, removing the common factor first shortens the solution.

Step 3

Exam Tip

पूरे समीकरण को (25) से भाग देने पर (x-2-(a+b)x+ab=0) मिलता है। परीक्षा में पहले सामान्य गुणक हटाना हल को छोटा करता है।

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\(x^4-17x^2+16=0\) में \(y=x^2\) रखने पर कौनसा समीकरण मिलेगा?

If \(y=x^2\) is put in \(x^4-17x^2+16=0\), which equation is obtained?

Explanation opens after your attempt
Correct Answer

A. \(y^2-17y+16=0\)

Step 1

Concept

Since (x-4=\(x^2\)2=y-2), the new equation is \(y^2-17y+16=0\). In exams, use substitution to form a quadratic.

Step 2

Why this answer is correct

The correct answer is A. \(y^2-17y+16=0\). Since (x-4=\(x^2\)2=y-2), the new equation is \(y^2-17y+16=0\). In exams, use substitution to form a quadratic.

Step 3

Exam Tip

क्योंकि (x-4=\(x^2\)2=y-2), इसलिए नया समीकरण \(y^2-17y+16=0\) है। परीक्षा में प्रतिस्थापन से द्विघात रूप बनाएं।

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\(x^4-17x^2+16=0\) के वास्तविक हल कौनसे हैं?

What are the real solutions of \(x^4-17x^2+16=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=\pm1,\pm4\)

Step 1

Concept

From \(y^2-17y+16=0\), (y=1,16), so \(x^2=1,16\) and \(x=\pm1,\pm4\). In exams, do not forget to return to (x).

Step 2

Why this answer is correct

The correct answer is A. \(x=\pm1,\pm4\). From \(y^2-17y+16=0\), (y=1,16), so \(x^2=1,16\) and \(x=\pm1,\pm4\). In exams, do not forget to return to (x).

Step 3

Exam Tip

\(y^2-17y+16=0\) से (y=1,16), इसलिए \(x^2=1,16\) और \(x=\pm1,\pm4\) हैं। परीक्षा में वापस (x) के मान निकालना न भूलें।

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\(\frac{1}{x}+x=\frac{26}{5}\), \(x\neq0\), को द्विघात रूप में बदलने पर क्या मिलेगा?

For \(\frac{1}{x}+x=\frac{26}{5}\), \(x\neq0\), what quadratic form is obtained?

Explanation opens after your attempt
Correct Answer

A. \(5x^2-26x+5=0\)

Step 1

Concept

Multiplying both sides by (5x) gives \(5+5x^2=26x\), that is \(5x^2-26x+5=0\). In exams, remember the condition \(x\neq0\).

Step 2

Why this answer is correct

The correct answer is A. \(5x^2-26x+5=0\). Multiplying both sides by (5x) gives \(5+5x^2=26x\), that is \(5x^2-26x+5=0\). In exams, remember the condition \(x\neq0\).

Step 3

Exam Tip

दोनों पक्षों को (5x) से गुणा करने पर \(5+5x^2=26x\), यानी \(5x^2-26x+5=0\) मिलता है। परीक्षा में \(x\neq0\) शर्त याद रखें।

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\(\frac{1}{x}+x=\frac{26}{5}\), \(x\neq0\), के हल क्या हैं?

What are the solutions of \(\frac{1}{x}+x=\frac{26}{5}\), \(x\neq0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=5,\frac{1}{5}\)

Step 1

Concept

(5x-2-26x+5=(5x-1)(x-5)), so \(x=\frac{1}{5}\) and (5). In exams, check whether obtained roots are valid in the original equation.

Step 2

Why this answer is correct

The correct answer is A. \(x=5,\frac{1}{5}\). (5x-2-26x+5=(5x-1)(x-5)), so \(x=\frac{1}{5}\) and (5). In exams, check whether obtained roots are valid in the original equation.

Step 3

Exam Tip

(5x-2-26x+5=(5x-1)(x-5)), इसलिए \(x=\frac{1}{5}\) और (5) हैं। परीक्षा में प्राप्त हल मूल समीकरण में मान्य हैं या नहीं जांचें।

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\(\frac{x+4}{x}=\frac{25}{x+4}\), \(x\neq0,-4\), का सही द्विघात रूप कौनसा है?

What is the correct quadratic form of \(\frac{x+4}{x}=\frac{25}{x+4}\), \(x\neq0,-4\)?

Explanation opens after your attempt
Correct Answer

A. \(x^2-17x+16=0\)

Step 1

Concept

Cross multiplication gives ((x+4)2=25x), so \(x^2+8x+16-25x=0\), and \(x^2-17x+16=0\). In exams, cross multiply carefully.

Step 2

Why this answer is correct

The correct answer is A. \(x^2-17x+16=0\). Cross multiplication gives ((x+4)2=25x), so \(x^2+8x+16-25x=0\), and \(x^2-17x+16=0\). In exams, cross multiply carefully.

Step 3

Exam Tip

क्रॉस गुणा करने पर ((x+4)2=25x), इसलिए \(x^2+8x+16-25x=0\) और \(x^2-17x+16=0\) है। परीक्षा में क्रॉस गुणा सावधानी से करें।

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\(\frac{x+4}{x}=\frac{25}{x+4}\), \(x\neq0,-4\), के हल क्या हैं?

What are the solutions of \(\frac{x+4}{x}=\frac{25}{x+4}\), \(x\neq0,-4\)?

Explanation opens after your attempt
Correct Answer

A. (x=1,16)

Step 1

Concept

(x-2-17x+16=(x-1)(x-16)), so (x=1) and (x=16). In exams, check solutions against excluded denominator values.

Step 2

Why this answer is correct

The correct answer is A. (x=1,16). (x-2-17x+16=(x-1)(x-16)), so (x=1) and (x=16). In exams, check solutions against excluded denominator values.

Step 3

Exam Tip

(x-2-17x+16=(x-1)(x-16)), इसलिए (x=1) और (x=16) हैं। परीक्षा में हर के निषिद्ध मानों से हलों की जांच करें।

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\(x^2-10x+7=0\) के मूल द्विघात सूत्र से क्या हैं?

What are the roots of \(x^2-10x+7=0\) by quadratic formula?

Explanation opens after your attempt
Correct Answer

A. \(x=5\pm3\sqrt{2}\)

Step 1

Concept

(D=(-10)2-4(1)(7)=72), so \(x=\frac{10\pm6\sqrt{2}}{2}=5\pm3\sqrt{2}\). In exams, simplify the square root.

Step 2

Why this answer is correct

The correct answer is A. \(x=5\pm3\sqrt{2}\). (D=(-10)2-4(1)(7)=72), so \(x=\frac{10\pm6\sqrt{2}}{2}=5\pm3\sqrt{2}\). In exams, simplify the square root.

Step 3

Exam Tip

(D=(-10)2-4(1)(7)=72), इसलिए \(x=\frac{10\pm6\sqrt{2}}{2}=5\pm3\sqrt{2}\) है। परीक्षा में वर्गमूल को सरल करें।

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यदि \(6x^2+px+24=0\) के मूलों का योग (-8) है, तो (p) क्या होगा?

If the sum of roots of \(6x^2+px+24=0\) is (-8), what is (p)?

Explanation opens after your attempt
Correct Answer

A. (48)

Step 1

Concept

The sum of roots is \(-\frac{p}{6}\), so \(-\frac{p}{6}=-8\) gives (p=48). In exams, remember the sum formula \(-\frac{b}{a}\).

Step 2

Why this answer is correct

The correct answer is A. (48). The sum of roots is \(-\frac{p}{6}\), so \(-\frac{p}{6}=-8\) gives (p=48). In exams, remember the sum formula \(-\frac{b}{a}\).

Step 3

Exam Tip

मूलों का योग \(-\frac{p}{6}\) है, इसलिए \(-\frac{p}{6}=-8\) से (p=48) है। परीक्षा में योग का सूत्र \(-\frac{b}{a}\) याद रखें।

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यदि \(7x^2-15x+p=0\) के मूलों का गुणनफल \(\frac{2}{7}\) है, तो (p) क्या होगा?

If the product of roots of \(7x^2-15x+p=0\) is \(\frac{2}{7}\), what is (p)?

Explanation opens after your attempt
Correct Answer

A. (2)

Step 1

Concept

The product of roots is \(\frac{p}{7}\), so \(\frac{p}{7}=\frac{2}{7}\) gives (p=2). In exams, use the product formula \(\frac{c}{a}\).

Step 2

Why this answer is correct

The correct answer is A. (2). The product of roots is \(\frac{p}{7}\), so \(\frac{p}{7}=\frac{2}{7}\) gives (p=2). In exams, use the product formula \(\frac{c}{a}\).

Step 3

Exam Tip

मूलों का गुणनफल \(\frac{p}{7}\) है, इसलिए \(\frac{p}{7}=\frac{2}{7}\) से (p=2) है। परीक्षा में गुणनफल का सूत्र \(\frac{c}{a}\) लगाएं।

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यदि \(x^2-19x+88=0\) के मूल \(\alpha\) और \(\beta\) हैं, तो \(\alpha^2+\beta^2\) क्या होगा?

If the roots of \(x^2-19x+88=0\) are \(\alpha\) and \(\beta\), what is \(\alpha^2+\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. (185)

Step 1

Concept

\(\alpha+\beta=19\) and \(\alpha\beta=88\), so (\alpha-2+\beta-2=192-2(88)=185). In exams, remember (\(\alpha+\beta\)2-2\alpha\beta).

Step 2

Why this answer is correct

The correct answer is A. (185). \(\alpha+\beta=19\) and \(\alpha\beta=88\), so (\alpha-2+\beta-2=192-2(88)=185). In exams, remember (\(\alpha+\beta\)2-2\alpha\beta).

Step 3

Exam Tip

\(\alpha+\beta=19\) और \(\alpha\beta=88\), इसलिए (\alpha-2+\beta-2=192-2(88)=185) है। परीक्षा में (\(\alpha+\beta\)2-2\alpha\beta) याद रखें।

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यदि \(x^2-16x+63=0\) के मूल \(\alpha\) और \(\beta\) हैं, तो \(\frac{1}{\alpha}+\frac{1}{\beta}\) क्या होगा?

If the roots of \(x^2-16x+63=0\) are \(\alpha\) and \(\beta\), what is \(\frac{1}{\alpha}+\frac{1}{\beta}\)?

Explanation opens after your attempt
Correct Answer

A. \( \frac{16}{63}\)

Step 1

Concept

\(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}=\frac{16}{63}\). In exams, first write sum and product in reciprocal questions.

Step 2

Why this answer is correct

The correct answer is A. \( \frac{16}{63}\). \(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}=\frac{16}{63}\). In exams, first write sum and product in reciprocal questions.

Step 3

Exam Tip

\(\frac{1}{\alpha}+\frac{1}{\beta}=\frac{\alpha+\beta}{\alpha\beta}=\frac{16}{63}\) होता है। परीक्षा में reciprocal वाले प्रश्न में पहले योग और गुणनफल लिखें।

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यदि \(\alpha,\beta\) समीकरण \(5x^2-17x+6=0\) के मूल हैं, तो \(\alpha+\beta\) क्या है?

If \(\alpha,\beta\) are roots of \(5x^2-17x+6=0\), what is \(\alpha+\beta\)?

Explanation opens after your attempt
Correct Answer

A. \( \frac{17}{5}\)

Step 1

Concept

The sum of roots is \(-\frac{b}{a}=-\frac{-17}{5}=\frac{17}{5}\). In exams, keep the sign of (b) carefully.

Step 2

Why this answer is correct

The correct answer is A. \( \frac{17}{5}\). The sum of roots is \(-\frac{b}{a}=-\frac{-17}{5}=\frac{17}{5}\). In exams, keep the sign of (b) carefully.

Step 3

Exam Tip

मूलों का योग \(-\frac{b}{a}=-\frac{-17}{5}=\frac{17}{5}\) है। परीक्षा में (b) का चिन्ह ध्यान से रखें।

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यदि \(\alpha,\beta\) समीकरण \(5x^2-17x+6=0\) के मूल हैं, तो \(\alpha\beta\) क्या है?

If \(\alpha,\beta\) are roots of \(5x^2-17x+6=0\), what is \(\alpha\beta\)?

Explanation opens after your attempt
Correct Answer

A. \( \frac{6}{5}\)

Step 1

Concept

The product of roots is \(\frac{c}{a}=\frac{6}{5}\). In exams, use \(\frac{c}{a}\) for the product.

Step 2

Why this answer is correct

The correct answer is A. \( \frac{6}{5}\). The product of roots is \(\frac{c}{a}=\frac{6}{5}\). In exams, use \(\frac{c}{a}\) for the product.

Step 3

Exam Tip

मूलों का गुणनफल \(\frac{c}{a}=\frac{6}{5}\) है। परीक्षा में गुणनफल के लिए \(\frac{c}{a}\) का प्रयोग करें।

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यदि \(5x^2-17x+6=0\) के मूल \(\alpha,\beta\) हैं, तो (\(\alpha-\beta\)2) क्या होगा?

If \(\alpha,\beta\) are roots of \(5x^2-17x+6=0\), what is (\(\alpha-\beta\)2)?

Explanation opens after your attempt
Correct Answer

A. \( \frac{169}{25}\)

Step 1

Concept

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta=\left\(\frac{17}{5}\right\)2-\frac{24}{5}=\frac{169}{25}). In exams, convert fractions to a common denominator.

Step 2

Why this answer is correct

The correct answer is A. \( \frac{169}{25}\). (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta=\left\(\frac{17}{5}\right\)2-\frac{24}{5}=\frac{169}{25}). In exams, convert fractions to a common denominator.

Step 3

Exam Tip

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta=\left\(\frac{17}{5}\right\)2-\frac{24}{5}=\frac{169}{25}) है। परीक्षा में भिन्नों को समान हर में बदलें।

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यदि \(x^2-12x+n=0\) के वास्तविक मूल नहीं हैं, तो (n) के लिए कौनसी शर्त सही है?

If \(x^2-12x+n=0\) has no real roots, which condition on (n) is correct?

Explanation opens after your attempt
Correct Answer

A. (n>36)

Step 1

Concept

For no real roots, (D<0), so (144-4n<0) and (n>36). In exams, connect (D<0) with no real roots.

Step 2

Why this answer is correct

The correct answer is A. (n>36). For no real roots, (D<0), so (144-4n<0) and (n>36). In exams, connect (D<0) with no real roots.

Step 3

Exam Tip

वास्तविक मूल नहीं होने के लिए (D<0), इसलिए (144-4n<0) और (n>36) है। परीक्षा में (D<0) को वास्तविक मूल नहीं से जोड़ें।

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यदि \(x^2-12x+n=0\) के दो अलग वास्तविक मूल हैं, तो (n) के लिए कौनसी शर्त सही है?

If \(x^2-12x+n=0\) has two distinct real roots, which condition on (n) is correct?

Explanation opens after your attempt
Correct Answer

A. (n<36)

Step 1

Concept

For two distinct real roots, (D>0), so (144-4n>0) and (n<36). In exams, connect (D>0) with distinct real roots.

Step 2

Why this answer is correct

The correct answer is A. (n<36). For two distinct real roots, (D>0), so (144-4n>0) and (n<36). In exams, connect (D>0) with distinct real roots.

Step 3

Exam Tip

दो अलग वास्तविक मूलों के लिए (D>0), इसलिए (144-4n>0) और (n<36) है। परीक्षा में (D>0) को अलग वास्तविक मूल से जोड़ें।

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\(6x^2-11x-10=0\) को हल करने में कौनसा गुणनखंड रूप सही है?

Which factorised form is correct for solving \(6x^2-11x-10=0\)?

Explanation opens after your attempt
Correct Answer

A. ((3x+2)(2x-5)=0)

Step 1

Concept

((3x+2)(2x-5)=6x-2-11x-10), so it is correct. In exams, verify factorisation by expanding.

Step 2

Why this answer is correct

The correct answer is A. ((3x+2)(2x-5)=0). ((3x+2)(2x-5)=6x-2-11x-10), so it is correct. In exams, verify factorisation by expanding.

Step 3

Exam Tip

((3x+2)(2x-5)=6x-2-11x-10), इसलिए यह सही है। परीक्षा में गुणनखंड को विस्तार करके जांचें।

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\(6x^2-11x-10=0\) के मूल क्या हैं?

What are the roots of \(6x^2-11x-10=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=\frac{5}{2},-\frac{2}{3}\)

Step 1

Concept

((3x+2)(2x-5)=0), so \(x=-\frac{2}{3}\) and \(\frac{5}{2}\). In exams, change signs while writing roots.

Step 2

Why this answer is correct

The correct answer is A. \(x=\frac{5}{2},-\frac{2}{3}\). ((3x+2)(2x-5)=0), so \(x=-\frac{2}{3}\) and \(\frac{5}{2}\). In exams, change signs while writing roots.

Step 3

Exam Tip

((3x+2)(2x-5)=0), इसलिए \(x=-\frac{2}{3}\) और \(\frac{5}{2}\) हैं। परीक्षा में संकेत बदलकर मूल लिखें।

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यदि \(x^2+10x+6=0\), तो पूर्ण वर्ग विधि से सही रूप कौनसा है?

If \(x^2+10x+6=0\), which form is correct by completing square?

Explanation opens after your attempt
Correct Answer

A. ((x+5)2=19)

Step 1

Concept

Adding (25) to \(x^2+10x=-6\) gives ((x+5)2=19). In exams, add the same number to both sides.

Step 2

Why this answer is correct

The correct answer is A. ((x+5)2=19). Adding (25) to \(x^2+10x=-6\) gives ((x+5)2=19). In exams, add the same number to both sides.

Step 3

Exam Tip

\(x^2+10x=-6\) में (25) जोड़ने पर ((x+5)2=19) मिलता है। परीक्षा में दोनों पक्षों में समान संख्या जोड़ें।

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\(x^2+10x+6=0\) के मूल क्या हैं?

What are the roots of \(x^2+10x+6=0\)?

Explanation opens after your attempt
Correct Answer

A. \(x=-5\pm\sqrt{19}\)

Step 1

Concept

Since ((x+5)2=19), \(x=-5\pm\sqrt{19}\). In exams, write both values using \(\pm\).

Step 2

Why this answer is correct

The correct answer is A. \(x=-5\pm\sqrt{19}\). Since ((x+5)2=19), \(x=-5\pm\sqrt{19}\). In exams, write both values using \(\pm\).

Step 3

Exam Tip

((x+5)2=19), इसलिए \(x=-5\pm\sqrt{19}\) है। परीक्षा में \(\pm\) के दोनों मान लिखें।

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यदि \(x^2-8x-20=0\) के मूल \(\alpha,\beta\) हैं, तो \(\alpha^2\beta+\alpha\beta^2\) क्या होगा?

If the roots of \(x^2-8x-20=0\) are \(\alpha,\beta\), what is \(\alpha^2\beta+\alpha\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. (-160)

Step 1

Concept

(\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)), where \(\alpha+\beta=8\) and \(\alpha\beta=-20\), so the value is (-160). In exams, factor the expression first.

Step 2

Why this answer is correct

The correct answer is A. (-160). (\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)), where \(\alpha+\beta=8\) and \(\alpha\beta=-20\), so the value is (-160). In exams, factor the expression first.

Step 3

Exam Tip

(\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)), जहां \(\alpha+\beta=8\) और \(\alpha\beta=-20\), इसलिए मान (-160) है। परीक्षा में अभिव्यक्ति को पहले factor करें।

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यदि \(x^2+px+36=0\) का एक मूल दूसरे मूल का दुगुना है और दोनों ऋणात्मक हैं, तो (p) क्या होगा?

If one root of \(x^2+px+36=0\) is double the other and both are negative, what is (p)?

Explanation opens after your attempt
Correct Answer

A. \(9\sqrt{2}\)

Step 1

Concept

Let the roots be (-r) and (-2r), then \(2r^2=36\) gives \(r=3\sqrt{2}\), and \(p=3r=9\sqrt{2}\). In exams, keep signs of both roots carefully.

Step 2

Why this answer is correct

The correct answer is A. \(9\sqrt{2}\). Let the roots be (-r) and (-2r), then \(2r^2=36\) gives \(r=3\sqrt{2}\), and \(p=3r=9\sqrt{2}\). In exams, keep signs of both roots carefully.

Step 3

Exam Tip

मूलों को (-r) और (-2r) मानें, तो \(2r^2=36\) से \(r=3\sqrt{2}\) और \(p=3r=9\sqrt{2}\) है। परीक्षा में दोनों मूलों के चिन्ह ध्यान से रखें।

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\(x^2-9x+5=0\) के मूलों का अंतर क्या है?

What is the difference between the roots of \(x^2-9x+5=0\)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{61}\)

Step 1

Concept

Here (D=(-9)2-4(1)(5)=61), so the difference of roots is \(\frac{\sqrt{D}}{|a|}=\sqrt{61}\). In exams, the difference of roots can be found directly from (D).

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{61}\). Here (D=(-9)2-4(1)(5)=61), so the difference of roots is \(\frac{\sqrt{D}}{|a|}=\sqrt{61}\). In exams, the difference of roots can be found directly from (D).

Step 3

Exam Tip

यहां (D=(-9)2-4(1)(5)=61), इसलिए मूलों का अंतर \(\frac{\sqrt{D}}{|a|}=\sqrt{61}\) है। परीक्षा में मूलों का अंतर सीधे (D) से मिल सकता है।

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\(5x^2-10x+13=0\) के वास्तविक मूलों के बारे में सही कथन क्या है?

What is the correct statement about real roots of \(5x^2-10x+13=0\)?

Explanation opens after your attempt
Correct Answer

A. वास्तविक मूल नहीं हैंThere are no real roots

Step 1

Concept

Here (D=(-10)2-4(5)(13)=-160<0), so there are no real roots. In exams, (D<0) means no real roots.

Step 2

Why this answer is correct

The correct answer is A. वास्तविक मूल नहीं हैं / There are no real roots. Here (D=(-10)2-4(5)(13)=-160<0), so there are no real roots. In exams, (D<0) means no real roots.

Step 3

Exam Tip

यहां (D=(-10)2-4(5)(13)=-160<0), इसलिए वास्तविक मूल नहीं हैं। परीक्षा में (D<0) का अर्थ वास्तविक मूल नहीं है।

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\(5x^2-10x+13=0\) में पूर्ण वर्ग रूप कौनसा सही है?

Which completed square form is correct for \(5x^2-10x+13=0\)?

Explanation opens after your attempt
Correct Answer

A. (5(x-1)2+8=0)

Step 1

Concept

(5x-2-10x+13=5(x-1)2+8), so it cannot be zero for real (x). In exams, completed square form also shows the nature of roots.

Step 2

Why this answer is correct

The correct answer is A. (5(x-1)2+8=0). (5x-2-10x+13=5(x-1)2+8), so it cannot be zero for real (x). In exams, completed square form also shows the nature of roots.

Step 3

Exam Tip

(5x-2-10x+13=5(x-1)2+8), इसलिए यह वास्तविक (x) के लिए शून्य नहीं हो सकता। परीक्षा में पूर्ण वर्ग रूप से भी मूलों की प्रकृति दिखती है।

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यदि \(x^2-12x+20=0\) के मूल \(\alpha,\beta\) हैं, तो नए मूल \(\alpha+4,\beta+4\) वाला समीकरण कौनसा है?

If roots of \(x^2-12x+20=0\) are \(\alpha,\beta\), which equation has roots \(\alpha+4,\beta+4\)?

Explanation opens after your attempt
Correct Answer

A. \(x^2-20x+84=0\)

Step 1

Concept

The roots are (2,10), so new roots are (6,14), and the equation is ((x-6)(x-14)=0). In exams, form the new roots and then the new equation.

Step 2

Why this answer is correct

The correct answer is A. \(x^2-20x+84=0\). The roots are (2,10), so new roots are (6,14), and the equation is ((x-6)(x-14)=0). In exams, form the new roots and then the new equation.

Step 3

Exam Tip

मूल (2,10) हैं, इसलिए नए मूल (6,14) होंगे और समीकरण ((x-6)(x-14)=0) है। परीक्षा में नए मूल बनाकर नया समीकरण लिखें।

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यदि \(x^2-18x+77=0\) के मूल \(\alpha,\beta\) हैं, तो \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}\) क्या होगा?

If the roots of \(x^2-18x+77=0\) are \(\alpha,\beta\), what is \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}\)?

Explanation opens after your attempt
Correct Answer

A. \( \frac{170}{77}\)

Step 1

Concept

\(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\), where \(\alpha+\beta=18\) and \(\alpha\beta=77\), so the value is \(\frac{324-154}{77}=\frac{170}{77}\). In exams, convert expressions into sum and product.

Step 2

Why this answer is correct

The correct answer is A. \( \frac{170}{77}\). \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\), where \(\alpha+\beta=18\) and \(\alpha\beta=77\), so the value is \(\frac{324-154}{77}=\frac{170}{77}\). In exams, convert expressions into sum and product.

Step 3

Exam Tip

\(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\), जहां \(\alpha+\beta=18\) और \(\alpha\beta=77\), इसलिए मान \(\frac{324-154}{77}=\frac{170}{77}\) है। परीक्षा में अभिव्यक्ति को योग और गुणनफल में बदलें।

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यदि \(kx^2-18x+81=0\) के समान मूल हैं, तो (k) क्या होगा?

If \(kx^2-18x+81=0\) has equal roots, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For equal roots, (D=0), so (324-324k=0) and (k=1). In exams, keep (a=k) correctly.

Step 2

Why this answer is correct

The correct answer is A. (1). For equal roots, (D=0), so (324-324k=0) and (k=1). In exams, keep (a=k) correctly.

Step 3

Exam Tip

समान मूलों के लिए (D=0), इसलिए (324-324k=0) और (k=1) है। परीक्षा में (a=k) को ठीक से रखें।

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(x-2-2(k+5)x+k-2=0) के समान मूलों के लिए (k) क्या होगा?

What is (k) for equal roots of (x-2-2(k+5)x+k-2=0)?

Explanation opens after your attempt
Correct Answer

A. \(k=-\frac{5}{2}\)

Step 1

Concept

(D=4(k+5)2-4k-2=0) gives ((k+5)2=k-2), so (10k+25=0) and \(k=-\frac{5}{2}\). In exams, expand squares carefully.

Step 2

Why this answer is correct

The correct answer is A. \(k=-\frac{5}{2}\). (D=4(k+5)2-4k-2=0) gives ((k+5)2=k-2), so (10k+25=0) and \(k=-\frac{5}{2}\). In exams, expand squares carefully.

Step 3

Exam Tip

(D=4(k+5)2-4k-2=0) से ((k+5)2=k-2), इसलिए (10k+25=0) और \(k=-\frac{5}{2}\) है। परीक्षा में वर्ग फैलाते समय सावधानी रखें।

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यदि ((x-5)(x-11)=0), तो शून्य गुणनफल नियम से हल क्या होंगे?

If ((x-5)(x-11)=0), what are the solutions by zero product rule?

Explanation opens after your attempt
Correct Answer

A. (x=5,11)

Step 1

Concept

((x-5)=0) or ((x-11)=0), so (x=5) or (x=11). In exams, set each factor equal to zero separately.

Step 2

Why this answer is correct

The correct answer is A. (x=5,11). ((x-5)=0) or ((x-11)=0), so (x=5) or (x=11). In exams, set each factor equal to zero separately.

Step 3

Exam Tip

((x-5)=0) या ((x-11)=0), इसलिए (x=5) या (x=11) है। परीक्षा में हर गुणनखंड को अलग शून्य रखें।

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यदि ((x-5)(x-11)=18), तो मानक द्विघात समीकरण क्या होगा?

If ((x-5)(x-11)=18), what is the standard quadratic equation?

Explanation opens after your attempt
Correct Answer

A. \(x^2-16x+37=0\)

Step 1

Concept

((x-5)(x-11)=x-2-16x+55), so \(x^2-16x+55=18\) gives \(x^2-16x+37=0\). In exams, bring all terms to one side after expansion.

Step 2

Why this answer is correct

The correct answer is A. \(x^2-16x+37=0\). ((x-5)(x-11)=x-2-16x+55), so \(x^2-16x+55=18\) gives \(x^2-16x+37=0\). In exams, bring all terms to one side after expansion.

Step 3

Exam Tip

((x-5)(x-11)=x-2-16x+55), इसलिए \(x^2-16x+55=18\) से \(x^2-16x+37=0\) मिलता है। परीक्षा में विस्तार के बाद सभी पद एक तरफ लाएं।

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\(x^2-16x+37=0\) के मूल द्विघात सूत्र से क्या होंगे?

What are the roots of \(x^2-16x+37=0\) by quadratic formula?

Explanation opens after your attempt
Correct Answer

A. \(x=8\pm3\sqrt{3}\)

Step 1

Concept

Here (D=(-16)2-4(1)(37)=108), so \(x=\frac{16\pm6\sqrt{3}}{2}=8\pm3\sqrt{3}\). In exams, simplify (D) correctly.

Step 2

Why this answer is correct

The correct answer is A. \(x=8\pm3\sqrt{3}\). Here (D=(-16)2-4(1)(37)=108), so \(x=\frac{16\pm6\sqrt{3}}{2}=8\pm3\sqrt{3}\). In exams, simplify (D) correctly.

Step 3

Exam Tip

यहां (D=(-16)2-4(1)(37)=108), इसलिए \(x=\frac{16\pm6\sqrt{3}}{2}=8\pm3\sqrt{3}\) है। परीक्षा में (D) को सही सरल करें।

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