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Class 10 Mathematics - Quadratic Equations - Roots of a Quadratic Equation Hard Quiz

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यदि \(x^2-7x+k=0\) की जड़ें एक-दूसरे की व्युत्क्रम हैं, तो (k) का मान क्या होगा?

If the roots of \(x^2-7x+k=0\) are reciprocals of each other, what is the value of (k)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For reciprocal roots, the product is (1), and here the product is (k). Hence (k=1); in exams, check the product first.

Step 2

Why this answer is correct

The correct answer is A. (1). For reciprocal roots, the product is (1), and here the product is (k). Hence (k=1); in exams, check the product first.

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए गुणनफल (1) होता है और यहाँ गुणनफल (k) है। इसलिए (k=1); परीक्षा में पहले गुणनफल देखें।

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यदि \(2x^2-5x+m=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^2+\beta^2=\frac{13}{4}\), तो (m) ज्ञात कीजिए।

If the roots of \(2x^2-5x+m=0\) are \(\alpha,\beta\) and \(\alpha^2+\beta^2=\frac{13}{4}\), find (m).

Explanation opens after your attempt
Correct Answer

B. (3)

Step 1

Concept

Here \(\alpha+\beta=\frac{5}{2}\) and \(\alpha\beta=\frac{m}{2}\). Using (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta), we get (m=3).

Step 2

Why this answer is correct

The correct answer is B. (3). Here \(\alpha+\beta=\frac{5}{2}\) and \(\alpha\beta=\frac{m}{2}\). Using (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta), we get (m=3).

Step 3

Exam Tip

यहाँ \(\alpha+\beta=\frac{5}{2}\) और \(\alpha\beta=\frac{m}{2}\) है। (\alpha-2+\beta-2=\(\alpha+\beta\)2-2\alpha\beta) से (m=3) मिलता है।

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(kx-2-2(k+1)x+(k+4)=0) की जड़ें समान हों, तो (k) का मान क्या है?

For (kx-2-2(k+1)x+(k+4)=0) to have equal roots, what is the value of (k)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{1}{2}\)

Step 1

Concept

For equal roots, the discriminant (D=0). Since (D=4(1-2k)), we get \(k=\frac{1}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{1}{2}\). For equal roots, the discriminant (D=0). Since (D=4(1-2k)), we get \(k=\frac{1}{2}\).

Step 3

Exam Tip

समान जड़ों के लिए विविक्तकर (D=0) होता है। (D=4(1-2k)) रखने पर \(k=\frac{1}{2}\) आता है।

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(x-2-2(a+1)x+a-2+3=0) की जड़ें वास्तविक हों, इसके लिए (a) पर सही शर्त क्या है?

What is the correct condition on (a) so that (x-2-2(a+1)x+a-2+3=0) has real roots?

Explanation opens after your attempt
Correct Answer

B. \(a\ge 1\)

Step 1

Concept

For real roots, \(D\ge 0\) is required. Here (D=8(a-1)), so \(a\ge 1\) is correct.

Step 2

Why this answer is correct

The correct answer is B. \(a\ge 1\). For real roots, \(D\ge 0\) is required. Here (D=8(a-1)), so \(a\ge 1\) is correct.

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D\ge 0\) चाहिए। यहाँ (D=8(a-1)), इसलिए \(a\ge 1\) सही है।

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\(x^2-px+36=0\) की जड़ें धनात्मक पूर्णांक हैं और उनका अंतर (5) है, तो (p) का मान क्या है?

The roots of \(x^2-px+36=0\) are positive integers and their difference is (5). What is (p)?

Explanation opens after your attempt
Correct Answer

C. (13)

Step 1

Concept

The positive roots with product (36) and difference (5) are (4) and (9). Their sum is (13), so (p=13).

Step 2

Why this answer is correct

The correct answer is C. (13). The positive roots with product (36) and difference (5) are (4) and (9). Their sum is (13), so (p=13).

Step 3

Exam Tip

गुणनफल (36) और अंतर (5) वाली धनात्मक जड़ें (4) और (9) हैं। उनका योग (13) है, इसलिए (p=13)।

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यदि \(3x^2-10x+3=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\frac{1}{\alpha},\frac{1}{\beta}\) जड़ों वाला समीकरण कौन-सा है?

If \(\alpha,\beta\) are the roots of \(3x^2-10x+3=0\), which equation has roots \(\frac{1}{\alpha},\frac{1}{\beta}\)?

Explanation opens after your attempt
Correct Answer

A. \(3x^2-10x+3=0\)

Step 1

Concept

Here \(\alpha+\beta=\frac{10}{3}\) and \(\alpha\beta=1\). The reciprocal roots also have sum \(\frac{10}{3}\) and product (1).

Step 2

Why this answer is correct

The correct answer is A. \(3x^2-10x+3=0\). Here \(\alpha+\beta=\frac{10}{3}\) and \(\alpha\beta=1\). The reciprocal roots also have sum \(\frac{10}{3}\) and product (1).

Step 3

Exam Tip

यहाँ \(\alpha+\beta=\frac{10}{3}\) और \(\alpha\beta=1\) है। व्युत्क्रम जड़ों का योग \(\frac{10}{3}\) और गुणनफल (1) ही रहता है।

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यदि (x-2+(k-3)x+k=0) की एक जड़ दूसरी जड़ की दुगुनी है, तो (k) का मान क्या होगा?

If one root of (x-2+(k-3)x+k=0) is twice the other root, what is the value of (k)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{21+3\sqrt{33}}{4}\) या \(\frac{21-3\sqrt{33}}{4}\)\(\frac{21+3\sqrt{33}}{4}\) or \(\frac{21-3\sqrt{33}}{4}\)

Step 1

Concept

Taking the roots as (r) and (2r), we get (3r=3-k) and \(2r^2=k\). Solving \(2k^2-21k+18=0\) gives the two listed values.

Step 2

Why this answer is correct

The correct answer is A. \(\frac{21+3\sqrt{33}}{4}\) या \(\frac{21-3\sqrt{33}}{4}\) / \(\frac{21+3\sqrt{33}}{4}\) or \(\frac{21-3\sqrt{33}}{4}\). Taking the roots as (r) and (2r), we get (3r=3-k) and \(2r^2=k\). Solving \(2k^2-21k+18=0\) gives the two listed values.

Step 3

Exam Tip

जड़ें (r) और (2r) मानने पर (3r=3-k) और \(2r^2=k\) मिलता है। हल करने पर \(2k^2-21k+18=0\), इसलिए दिए गए दोनों मान मिलते हैं।

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यदि \(2x^2-7x+3=0\) की जड़ें \(\alpha,\beta\) हैं, तो (\(\alpha-\beta\)2) का मान क्या है?

If \(\alpha,\beta\) are the roots of \(2x^2-7x+3=0\), what is the value of (\(\alpha-\beta\)2)?

Explanation opens after your attempt
Correct Answer

B. \(\frac{25}{4}\)

Step 1

Concept

Use (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). Here \(\alpha+\beta=\frac{7}{2}\) and \(\alpha\beta=\frac{3}{2}\), so the value is \(\frac{25}{4}\).

Step 2

Why this answer is correct

The correct answer is B. \(\frac{25}{4}\). Use (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). Here \(\alpha+\beta=\frac{7}{2}\) and \(\alpha\beta=\frac{3}{2}\), so the value is \(\frac{25}{4}\).

Step 3

Exam Tip

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta) का प्रयोग करें। यहाँ \(\alpha+\beta=\frac{7}{2}\) और \(\alpha\beta=\frac{3}{2}\), इसलिए मान \(\frac{25}{4}\) है।

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(x-2+2(k-1)x+k+5=0) की जड़ें समान हों, तो (k) के मान कौन-से हैं?

If (x-2+2(k-1)x+k+5=0) has equal roots, what are the values of (k)?

Explanation opens after your attempt
Correct Answer

A. (4) और (-1)(4) and (-1)

Step 1

Concept

For equal roots, put (D=0). This gives \(k^2-3k-4=0\), so (k=4) or (k=-1).

Step 2

Why this answer is correct

The correct answer is A. (4) और (-1) / (4) and (-1). For equal roots, put (D=0). This gives \(k^2-3k-4=0\), so (k=4) or (k=-1).

Step 3

Exam Tip

समान जड़ों के लिए (D=0) रखें। इससे \(k^2-3k-4=0\) मिलता है, इसलिए (k=4) या (k=-1)।

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यदि \(x^2-6x+m=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha^3+\beta^3=72\), तो (m) क्या होगा?

If \(\alpha,\beta\) are the roots of \(x^2-6x+m=0\) and \(\alpha^3+\beta^3=72\), what is (m)?

Explanation opens after your attempt
Correct Answer

C. (8)

Step 1

Concept

Here \(\alpha+\beta=6\) and \(\alpha\beta=m\). Using (\alpha-3+\beta-3=\(\alpha+\beta\)3-3\alpha\beta\(\alpha+\beta\)), we get (m=8).

Step 2

Why this answer is correct

The correct answer is C. (8). Here \(\alpha+\beta=6\) and \(\alpha\beta=m\). Using (\alpha-3+\beta-3=\(\alpha+\beta\)3-3\alpha\beta\(\alpha+\beta\)), we get (m=8).

Step 3

Exam Tip

\(\alpha+\beta=6\) और \(\alpha\beta=m\) है। (\alpha-3+\beta-3=\(\alpha+\beta\)3-3\alpha\beta\(\alpha+\beta\)) से (m=8) मिलता है।

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यदि (x-2+(a-2)x+a=0) की जड़ों का अंतर (3) है, तो (a) का मान क्या है?

If the difference between the roots of (x-2+(a-2)x+a=0) is (3), what is the value of (a)?

Explanation opens after your attempt
Correct Answer

A. \(4+\sqrt{21}\) या \(4-\sqrt{21}\)\(4+\sqrt{21}\) or \(4-\sqrt{21}\)

Step 1

Concept

Put (\(\alpha-\beta\)2=9) in (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). This gives \(a^2-8a-5=0\), so \(a=4\pm\sqrt{21}\).

Step 2

Why this answer is correct

The correct answer is A. \(4+\sqrt{21}\) या \(4-\sqrt{21}\) / \(4+\sqrt{21}\) or \(4-\sqrt{21}\). Put (\(\alpha-\beta\)2=9) in (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). This gives \(a^2-8a-5=0\), so \(a=4\pm\sqrt{21}\).

Step 3

Exam Tip

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta) में (\(\alpha-\beta\)2=9) रखें। इससे \(a^2-8a-5=0\) और \(a=4\pm\sqrt{21}\) मिलता है।

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\(x^2-5x+6=0\) की जड़ें \(\alpha,\beta\) हैं। \(\alpha+1,\beta+1\) जड़ों वाला समीकरण कौन-सा है?

The roots of \(x^2-5x+6=0\) are \(\alpha,\beta\). Which equation has roots \(\alpha+1,\beta+1\)?

Explanation opens after your attempt
Correct Answer

A. \(x^2-7x+12=0\)

Step 1

Concept

The original roots are (2) and (3), so the new roots are (3) and (4). Their equation is \(x^2-7x+12=0\).

Step 2

Why this answer is correct

The correct answer is A. \(x^2-7x+12=0\). The original roots are (2) and (3), so the new roots are (3) and (4). Their equation is \(x^2-7x+12=0\).

Step 3

Exam Tip

मूल जड़ें (2) और (3) हैं, इसलिए नई जड़ें (3) और (4) होंगी। उनका समीकरण \(x^2-7x+12=0\) है।

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यदि \(3x^2+px+12=0\) की जड़ें (1:4) के अनुपात में हैं, तो (p) के संभव मान क्या हैं?

If the roots of \(3x^2+px+12=0\) are in the ratio (1:4), what are the possible values of (p)?

Explanation opens after your attempt
Correct Answer

A. (15) या (-15)(15) or (-15)

Step 1

Concept

Let the roots be (r) and (4r). Then \(4r^2=4\), so \(r=\pm1\); using \(5r=-\frac{p}{3}\), we get \(p=\pm15\).

Step 2

Why this answer is correct

The correct answer is A. (15) या (-15) / (15) or (-15). Let the roots be (r) and (4r). Then \(4r^2=4\), so \(r=\pm1\); using \(5r=-\frac{p}{3}\), we get \(p=\pm15\).

Step 3

Exam Tip

जड़ें (r) और (4r) मानने पर \(4r^2=4\), इसलिए \(r=\pm1\)। योग \(5r=-\frac{p}{3}\) से \(p=\pm15\) मिलता है।

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\(x^2-2\sqrt{3}x+3=0\) की जड़ों की प्रकृति क्या है?

What is the nature of the roots of \(x^2-2\sqrt{3}x+3=0\)?

Explanation opens after your attempt
Correct Answer

B. दो समान वास्तविकTwo equal real

Step 1

Concept

Here (D=\(-2\sqrt{3}\)2-4(1)(3)=0). Therefore the roots are equal and real.

Step 2

Why this answer is correct

The correct answer is B. दो समान वास्तविक / Two equal real. Here (D=\(-2\sqrt{3}\)2-4(1)(3)=0). Therefore the roots are equal and real.

Step 3

Exam Tip

यहाँ (D=\(-2\sqrt{3}\)2-4(1)(3)=0) है। इसलिए दोनों जड़ें समान वास्तविक हैं।

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\(kx^2+6x+9=0\) की वास्तविक जड़ें हों और \(k\ne0\), तो (k) पर सही शर्त कौन-सी है?

For \(kx^2+6x+9=0\) to have real roots with \(k\ne0\), which condition on (k) is correct?

Explanation opens after your attempt
Correct Answer

A. \(k\le 1,\ k\ne0\)

Step 1

Concept

For real roots, \(D=36-36k\ge0\) is required. Thus \(k\le1\), and \(k\ne0\) is also needed for a quadratic equation.

Step 2

Why this answer is correct

The correct answer is A. \(k\le 1,\ k\ne0\). For real roots, \(D=36-36k\ge0\) is required. Thus \(k\le1\), and \(k\ne0\) is also needed for a quadratic equation.

Step 3

Exam Tip

वास्तविक जड़ों के लिए \(D=36-36k\ge0\) होना चाहिए। इसलिए \(k\le1\) और द्विघात के लिए \(k\ne0\) भी जरूरी है।

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यदि \(x^2+bx+c=0\) की जड़ें एक-दूसरे की विपरीत संख्याएँ हैं, तो कौन-सी शर्त अनिवार्य है?

If the roots of \(x^2+bx+c=0\) are opposites of each other, which condition is necessary?

Explanation opens after your attempt
Correct Answer

A. (b=0)

Step 1

Concept

Opposite roots have sum (0). Here the sum is (-b), so (b=0).

Step 2

Why this answer is correct

The correct answer is A. (b=0). Opposite roots have sum (0). Here the sum is (-b), so (b=0).

Step 3

Exam Tip

विपरीत जड़ों का योग (0) होता है। यहाँ योग (-b) है, इसलिए (b=0)।

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यदि \(x^2+4x+1=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}\) का मान क्या है?

If \(\alpha,\beta\) are the roots of \(x^2+4x+1=0\), what is \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}\)?

Explanation opens after your attempt
Correct Answer

C. (14)

Step 1

Concept

\(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\). With \(\alpha+\beta=-4\) and \(\alpha\beta=1\), the value is (14).

Step 2

Why this answer is correct

The correct answer is C. (14). \(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\). With \(\alpha+\beta=-4\) and \(\alpha\beta=1\), the value is (14).

Step 3

Exam Tip

\(\frac{\alpha}{\beta}+\frac{\beta}{\alpha}=\frac{\alpha^2+\beta^2}{\alpha\beta}\) होता है। \(\alpha+\beta=-4\) और \(\alpha\beta=1\) से मान (14) आता है।

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\(5x^2-2x+1=0\) की जड़ों के बारे में सही कथन कौन-सा है?

Which statement is correct about the roots of \(5x^2-2x+1=0\)?

Explanation opens after your attempt
Correct Answer

C. वास्तविक जड़ें नहींNo real roots

Step 1

Concept

Here (D=(-2)2-4(5)(1)=-16<0). Therefore the equation has no real roots.

Step 2

Why this answer is correct

The correct answer is C. वास्तविक जड़ें नहीं / No real roots. Here (D=(-2)2-4(5)(1)=-16<0). Therefore the equation has no real roots.

Step 3

Exam Tip

यहाँ (D=(-2)2-4(5)(1)=-16<0) है। इसलिए इस समीकरण की वास्तविक जड़ें नहीं हैं।

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यदि (x=2), \(kx^2-6x+4=0\) की जड़ है, तो (k) का मान क्या है?

If (x=2) is a root of \(kx^2-6x+4=0\), what is (k)?

Explanation opens after your attempt
Correct Answer

B. (2)

Step 1

Concept

Putting (x=2), we get (4k-12+4=0). Hence (4k=8) and (k=2).

Step 2

Why this answer is correct

The correct answer is B. (2). Putting (x=2), we get (4k-12+4=0). Hence (4k=8) and (k=2).

Step 3

Exam Tip

(x=2) रखने पर (4k-12+4=0) मिलता है। इसलिए (4k=8) और (k=2)।

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क्या ((m+1)x-2-2(m-1)x+(m-3)=0) की जड़ों का योग (2) हो सकता है?

Can the sum of the roots of ((m+1)x-2-2(m-1)x+(m-3)=0) be (2)?

Explanation opens after your attempt
Correct Answer

D. नहीं, कोई मान नहींNo, no value

Step 1

Concept

The sum of roots is (\frac{2(m-1)}{m+1}). Setting it equal to (2) gives (m-1=m+1), which is impossible.

Step 2

Why this answer is correct

The correct answer is D. नहीं, कोई मान नहीं / No, no value. The sum of roots is (\frac{2(m-1)}{m+1}). Setting it equal to (2) gives (m-1=m+1), which is impossible.

Step 3

Exam Tip

जड़ों का योग (\frac{2(m-1)}{m+1}) है। इसे (2) रखने पर (m-1=m+1) आता है, जो असंभव है।

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यदि \(x^2-3x-2=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\alpha^2,\beta^2\) जड़ों वाला समीकरण कौन-सा है?

If \(\alpha,\beta\) are the roots of \(x^2-3x-2=0\), which equation has roots \(\alpha^2,\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. \(x^2-13x+4=0\)

Step 1

Concept

Here \(\alpha+\beta=3\) and \(\alpha\beta=-2\). Thus \(\alpha^2+\beta^2=13\) and \(\alpha^2\beta^2=4\), so the equation is \(x^2-13x+4=0\).

Step 2

Why this answer is correct

The correct answer is A. \(x^2-13x+4=0\). Here \(\alpha+\beta=3\) and \(\alpha\beta=-2\). Thus \(\alpha^2+\beta^2=13\) and \(\alpha^2\beta^2=4\), so the equation is \(x^2-13x+4=0\).

Step 3

Exam Tip

\(\alpha+\beta=3\) और \(\alpha\beta=-2\) है। इसलिए \(\alpha^2+\beta^2=13\) और \(\alpha^2\beta^2=4\), अतः समीकरण \(x^2-13x+4=0\) है।

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यदि किसी द्विघात समीकरण की जड़ें \(2+\sqrt{5}\) और \(2-\sqrt{5}\) हैं, तो समीकरण कौन-सा है?

If the roots of a quadratic equation are \(2+\sqrt{5}\) and \(2-\sqrt{5}\), which is the equation?

Explanation opens after your attempt
Correct Answer

A. \(x^2-4x-1=0\)

Step 1

Concept

\(The sum of roots is (4) and the product is (-1). Use (x^2-(\)sum)x+product\(=0) to get the answer.\)

Step 2

Why this answer is correct

\(The correct answer is A. (x^2-4x-1=0). The sum of roots is (4) and the product is (-1). Use (x^2-(\)sum)x+product\(=0) to get the answer.\)

Step 3

Exam Tip

जड़ों का योग (4) और गुणनफल (-1) है। \(समीकरण (x^2-(\)योग)x+गुणनफल\(=0) से उत्तर मिलता है\)।

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\(x^2-4x+k=0\) की जड़ें वास्तविक और व्युत्क्रम हों, तो (k) का मान क्या है?

If the roots of \(x^2-4x+k=0\) are real and reciprocal, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 2

Why this answer is correct

The correct answer is A. (1). For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=k\), so (k=1), and (D=12>0) confirms real roots.

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\alpha\beta=1\) होता है। यहाँ \(\alpha\beta=k\), इसलिए (k=1), और (D=12>0) से जड़ें वास्तविक भी हैं।

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\(2x^2+\lambda x+8=0\) की जड़ें समान हों, तो \(\lambda\) के मान क्या होंगे?

If \(2x^2+\lambda x+8=0\) has equal roots, what are the values of \(\lambda\)?

Explanation opens after your attempt
Correct Answer

A. (8) और (-8)(8) and (-8)

Step 1

Concept

For equal roots, put (D=0). From \(\lambda^2-64=0\), we get \(\lambda=\pm8\).

Step 2

Why this answer is correct

The correct answer is A. (8) और (-8) / (8) and (-8). For equal roots, put (D=0). From \(\lambda^2-64=0\), we get \(\lambda=\pm8\).

Step 3

Exam Tip

समान जड़ों के लिए (D=0) रखें। \(\lambda^2-64=0\) से \(\lambda=\pm8\) मिलता है।

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यदि \(x^2-7x+10=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\frac{1}{\alpha-1}+\frac{1}{\beta-1}\) का मान क्या है?

If \(\alpha,\beta\) are roots of \(x^2-7x+10=0\), what is \(\frac{1}{\alpha-1}+\frac{1}{\beta-1}\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{5}{4}\)

Step 1

Concept

The denominator (\(\alpha-1\)\(\beta-1\)=\alpha\beta-\(\alpha+\beta\)+1=4). The numerator is \(\alpha+\beta-2=5\), so the value is \(\frac{5}{4}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{5}{4}\). The denominator (\(\alpha-1\)\(\beta-1\)=\alpha\beta-\(\alpha+\beta\)+1=4). The numerator is \(\alpha+\beta-2=5\), so the value is \(\frac{5}{4}\).

Step 3

Exam Tip

हर (\(\alpha-1\)\(\beta-1\)=\alpha\beta-\(\alpha+\beta\)+1=4) है। ऊपर \(\alpha+\beta-2=5\), इसलिए मान \(\frac{5}{4}\) है।

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(x-2-(k+2)x+2k=0) की जड़ों का अंतर (2) है, तो (k) के मान क्या हैं?

If the difference between the roots of (x-2-(k+2)x+2k=0) is (2), what are the values of (k)?

Explanation opens after your attempt
Correct Answer

A. (0) और (4)(0) and (4)

Step 1

Concept

(\(\alpha-\beta\)2=(k+2)2-8k=(k-2)2). Setting it equal to (4) gives (k=0) or (k=4).

Step 2

Why this answer is correct

The correct answer is A. (0) और (4) / (0) and (4). (\(\alpha-\beta\)2=(k+2)2-8k=(k-2)2). Setting it equal to (4) gives (k=0) or (k=4).

Step 3

Exam Tip

(\(\alpha-\beta\)2=(k+2)2-8k=(k-2)2) है। इसे (4) रखने पर (k=0) या (k=4) मिलता है।

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सामान्य द्विघात समीकरण \(ax^2+bx+c=0\) में जड़ें समान हों, तो सही संबंध कौन-सा है?

For the general quadratic equation \(ax^2+bx+c=0\), which relation is correct when the roots are equal?

Explanation opens after your attempt
Correct Answer

A. \(b^2=4ac\)

Step 1

Concept

For equal real roots, the discriminant \(D=b^2-4ac=0\). Therefore \(b^2=4ac\) is the correct relation.

Step 2

Why this answer is correct

The correct answer is A. \(b^2=4ac\). For equal real roots, the discriminant \(D=b^2-4ac=0\). Therefore \(b^2=4ac\) is the correct relation.

Step 3

Exam Tip

समान वास्तविक जड़ों के लिए विविक्तकर \(D=b^2-4ac=0\) होता है। इसलिए \(b^2=4ac\) सही संबंध है।

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(x-2-2x+(p+3)=0) की वास्तविक जड़ें न हों, इसके लिए (p) पर सही शर्त क्या है?

For (x-2-2x+(p+3)=0) to have no real roots, what is the correct condition on (p)?

Explanation opens after your attempt
Correct Answer

A. (p>-2)

Step 1

Concept

For no real roots, (D<0) is required. Here (D=-4(p+2)), so (p>-2).

Step 2

Why this answer is correct

The correct answer is A. (p>-2). For no real roots, (D<0) is required. Here (D=-4(p+2)), so (p>-2).

Step 3

Exam Tip

वास्तविक जड़ें न होने के लिए (D<0) चाहिए। यहाँ (D=-4(p+2)), इसलिए (p>-2) है।

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यदि \(2x^2+3x-5=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\alpha^2\beta+\alpha\beta^2\) का मान क्या है?

If \(\alpha,\beta\) are roots of \(2x^2+3x-5=0\), what is \(\alpha^2\beta+\alpha\beta^2\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{15}{4}\)

Step 1

Concept

(\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)). Since \(\alpha\beta=-\frac{5}{2}\) and \(\alpha+\beta=-\frac{3}{2}\), the value is \(\frac{15}{4}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{15}{4}\). (\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)). Since \(\alpha\beta=-\frac{5}{2}\) and \(\alpha+\beta=-\frac{3}{2}\), the value is \(\frac{15}{4}\).

Step 3

Exam Tip

(\alpha-2\beta+\alpha\beta-2=\alpha\beta\(\alpha+\beta\)) होता है। \(\alpha\beta=-\frac{5}{2}\) और \(\alpha+\beta=-\frac{3}{2}\), इसलिए मान \(\frac{15}{4}\) है।

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\(x^2+kx+16=0\) की जड़ें समान हों, तो (k) के संभव मान क्या हैं?

If \(x^2+kx+16=0\) has equal roots, what are the possible values of (k)?

Explanation opens after your attempt
Correct Answer

A. (8) और (-8)(8) and (-8)

Step 1

Concept

For equal roots, \(k^2-64=0\) must hold. Hence \(k=\pm8\).

Step 2

Why this answer is correct

The correct answer is A. (8) और (-8) / (8) and (-8). For equal roots, \(k^2-64=0\) must hold. Hence \(k=\pm8\).

Step 3

Exam Tip

समान जड़ों के लिए \(k^2-64=0\) होना चाहिए। अतः \(k=\pm8\) है।

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यदि \(x^2+ax+12=0\) की एक जड़ दूसरी जड़ से (3) अधिक है, तो (a) के संभव मान क्या हैं?

If one root of \(x^2+ax+12=0\) is (3) more than the other root, what are the possible values of (a)?

Explanation opens after your attempt
Correct Answer

A. \(\sqrt{57}\) और \(-\sqrt{57}\)\(\sqrt{57}\) and \(-\sqrt{57}\)

Step 1

Concept

Let the roots be (r) and (r+3). Then (r(r+3)=12), giving the sum as \(\pm\sqrt{57}\), so \(a=\mp\sqrt{57}\).

Step 2

Why this answer is correct

The correct answer is A. \(\sqrt{57}\) और \(-\sqrt{57}\) / \(\sqrt{57}\) and \(-\sqrt{57}\). Let the roots be (r) and (r+3). Then (r(r+3)=12), giving the sum as \(\pm\sqrt{57}\), so \(a=\mp\sqrt{57}\).

Step 3

Exam Tip

जड़ें (r) और (r+3) मानने पर (r(r+3)=12) मिलता है। इससे जड़ों का योग \(\pm\sqrt{57}\) होता है, इसलिए \(a=\mp\sqrt{57}\)।

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\(\frac{1}{2}\) और \(\frac{3}{4}\) जड़ों वाला द्विघात समीकरण कौन-सा है?

Which quadratic equation has roots \(\frac{1}{2}\) and \(\frac{3}{4}\)?

Explanation opens after your attempt
Correct Answer

A. \(8x^2-10x+3=0\)

Step 1

Concept

The sum is \(\frac{5}{4}\) and the product is \(\frac{3}{8}\). Multiply \(x^2-\frac{5}{4}x+\frac{3}{8}=0\) by (8).

Step 2

Why this answer is correct

The correct answer is A. \(8x^2-10x+3=0\). The sum is \(\frac{5}{4}\) and the product is \(\frac{3}{8}\). Multiply \(x^2-\frac{5}{4}x+\frac{3}{8}=0\) by (8).

Step 3

Exam Tip

जड़ों का योग \(\frac{5}{4}\) और गुणनफल \(\frac{3}{8}\) है। समीकरण \(x^2-\frac{5}{4}x+\frac{3}{8}=0\) को (8) से गुणा करें।

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यदि \(x^2+px+q=0\) की जड़ें \(\alpha,\beta\) हैं और \(\alpha+1,\beta+1\), \(x^2-5x+6=0\) की जड़ें हैं, तो (p,q) क्या होंगे?

If \(\alpha,\beta\) are the roots of \(x^2+px+q=0\) and \(\alpha+1,\beta+1\) are the roots of \(x^2-5x+6=0\), what are (p,q)?

Explanation opens after your attempt
Correct Answer

A. (p=-3,\ q=2)

Step 1

Concept

The sum of new roots is \(\alpha+\beta+2=5\), so (p=-3). From product (q-p+1=6), we get (q=2).

Step 2

Why this answer is correct

The correct answer is A. (p=-3,\ q=2). The sum of new roots is \(\alpha+\beta+2=5\), so (p=-3). From product (q-p+1=6), we get (q=2).

Step 3

Exam Tip

नई जड़ों का योग \(\alpha+\beta+2=5\) है, इसलिए (p=-3)। गुणनफल (q-p+1=6) से (q=2) मिलता है।

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(x-2-2(k+1)x+k-2=0) की जड़ें वास्तविक और भिन्न हों, तो (k) पर सही शर्त क्या है?

For (x-2-2(k+1)x+k-2=0) to have real and distinct roots, what is the correct condition on (k)?

Explanation opens after your attempt
Correct Answer

A. \(k>-\frac{1}{2}\)

Step 1

Concept

For real and distinct roots, (D>0) is needed. Here (D=4(2k+1)), so \(k>-\frac{1}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(k>-\frac{1}{2}\). For real and distinct roots, (D>0) is needed. Here (D=4(2k+1)), so \(k>-\frac{1}{2}\).

Step 3

Exam Tip

वास्तविक और भिन्न जड़ों के लिए (D>0) चाहिए। यहाँ (D=4(2k+1)), इसलिए \(k>-\frac{1}{2}\)।

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यदि \(x^2-5x+1=0\) की जड़ें \(\alpha,\beta\) हैं, तो \(\alpha^2+\beta^2\) का मान क्या है?

If \(\alpha,\beta\) are roots of \(x^2-5x+1=0\), what is \(\alpha^2+\beta^2\)?

Explanation opens after your attempt
Correct Answer

C. (23)

Step 1

Concept

Here \(\alpha+\beta=5\) and \(\alpha\beta=1\). Thus \(\alpha^2+\beta^2=25-2=23\).

Step 2

Why this answer is correct

The correct answer is C. (23). Here \(\alpha+\beta=5\) and \(\alpha\beta=1\). Thus \(\alpha^2+\beta^2=25-2=23\).

Step 3

Exam Tip

\(\alpha+\beta=5\) और \(\alpha\beta=1\) है। इसलिए \(\alpha^2+\beta^2=25-2=23\)।

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यदि किसी द्विघात समीकरण की जड़ें (3) और (-2) हैं और \(x^2\) का गुणांक (2) है, तो समीकरण कौन-सा है?

If the roots of a quadratic equation are (3) and (-2), and the coefficient of \(x^2\) is (2), which is the equation?

Explanation opens after your attempt
Correct Answer

A. \(2x^2-2x-12=0\)

Step 1

Concept

The monic equation is \(x^2-x-6=0\). Since the coefficient of \(x^2\) must be (2), multiply the whole equation by (2).

Step 2

Why this answer is correct

The correct answer is A. \(2x^2-2x-12=0\). The monic equation is \(x^2-x-6=0\). Since the coefficient of \(x^2\) must be (2), multiply the whole equation by (2).

Step 3

Exam Tip

मॉनिक समीकरण \(x^2-x-6=0\) है। \(x^2\) का गुणांक (2) चाहिए, इसलिए पूरे समीकरण को (2) से गुणा करें।

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यदि \(x^2+mx+n=0\) की जड़ें \(\alpha,\beta\) हैं, \(\alpha-\beta=4\) और \(\alpha\beta=5\), तो \(m^2\) क्या है?

If \(\alpha,\beta\) are roots of \(x^2+mx+n=0\), \(\alpha-\beta=4\), and \(\alpha\beta=5\), what is \(m^2\)?

Explanation opens after your attempt
Correct Answer

C. (36)

Step 1

Concept

Use (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). Since (16=\(\alpha+\beta\)2-20), we get (\(\alpha+\beta\)2=36) and \(m^2=36\).

Step 2

Why this answer is correct

The correct answer is C. (36). Use (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta). Since (16=\(\alpha+\beta\)2-20), we get (\(\alpha+\beta\)2=36) and \(m^2=36\).

Step 3

Exam Tip

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta) लगाएँ। (16=\(\alpha+\beta\)2-20), इसलिए (\(\alpha+\beta\)2=36) और \(m^2=36\)।

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(x-2-(a+3)x+3a=0) के बारे में कौन-सा कथन हमेशा सही है?

Which statement is always true about (x-2-(a+3)x+3a=0)?

Explanation opens after your attempt
Correct Answer

A. (3) हमेशा एक जड़ है(3) is always a root

Step 1

Concept

Putting (x=3) gives (9-3(a+3)+3a=0). Hence (3) is always one root, and the other root is (a).

Step 2

Why this answer is correct

The correct answer is A. (3) हमेशा एक जड़ है / (3) is always a root. Putting (x=3) gives (9-3(a+3)+3a=0). Hence (3) is always one root, and the other root is (a).

Step 3

Exam Tip

(x=3) रखने पर (9-3(a+3)+3a=0) मिलता है। इसलिए (3) हमेशा एक जड़ है और दूसरी जड़ (a) होती है।

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\(x^2-10x+k=0\) की जड़ें भिन्न अभाज्य संख्याएँ हैं, तो (k) का मान क्या है?

The roots of \(x^2-10x+k=0\) are distinct prime numbers. What is (k)?

Explanation opens after your attempt
Correct Answer

A. (21)

Step 1

Concept

The distinct prime roots with sum (10) are (3) and (7). Their product is (21), so (k=21).

Step 2

Why this answer is correct

The correct answer is A. (21). The distinct prime roots with sum (10) are (3) and (7). Their product is (21), so (k=21).

Step 3

Exam Tip

योग (10) वाली भिन्न अभाज्य जड़ें (3) और (7) हैं। उनका गुणनफल (21) है, इसलिए (k=21)।

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\(x^2+2x+c=0\) की जड़ें वास्तविक हैं और जड़ों का गुणनफल उनके योग से कम है, तो (c) पर सही शर्त क्या है?

For \(x^2+2x+c=0\), the roots are real and their product is less than their sum. What is the correct condition on (c)?

Explanation opens after your attempt
Correct Answer

A. (c<-2)

Step 1

Concept

The sum is (-2) and the product is (c), so (c<-2) is needed. This condition also satisfies (D=4-4c>0).

Step 2

Why this answer is correct

The correct answer is A. (c<-2). The sum is (-2) and the product is (c), so (c<-2) is needed. This condition also satisfies (D=4-4c>0).

Step 3

Exam Tip

योग (-2) और गुणनफल (c) है, इसलिए (c<-2) चाहिए। यह शर्त (D=4-4c>0) को भी पूरा करती है।

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(x-2-(m+1)x+m=0) की जड़ें एक-दूसरे की व्युत्क्रम हों, तो (m) का मान क्या है?

If the roots of (x-2-(m+1)x+m=0) are reciprocals of each other, what is (m)?

Explanation opens after your attempt
Correct Answer

A. (1)

Step 1

Concept

For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=m\), so (m=1).

Step 2

Why this answer is correct

The correct answer is A. (1). For reciprocal roots, \(\alpha\beta=1\). Here \(\alpha\beta=m\), so (m=1).

Step 3

Exam Tip

व्युत्क्रम जड़ों के लिए \(\alpha\beta=1\) होता है। यहाँ \(\alpha\beta=m\), इसलिए (m=1)।

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\(2x^2+kx+2=0\) की जड़ें समान और ऋणात्मक हों, तो (k) का मान क्या होगा?

If \(2x^2+kx+2=0\) has equal and negative roots, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

For equal roots, \(k^2-16=0\), so \(k=\pm4\). The equal root is \(-\frac{k}{4}\), which is negative only when (k=4).

Step 2

Why this answer is correct

The correct answer is A. (4). For equal roots, \(k^2-16=0\), so \(k=\pm4\). The equal root is \(-\frac{k}{4}\), which is negative only when (k=4).

Step 3

Exam Tip

समान जड़ों के लिए \(k^2-16=0\), इसलिए \(k=\pm4\)। समान जड़ \(-\frac{k}{4}\) है, जो ऋणात्मक तभी होगी जब (k=4)।

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यदि \(x^2-4x+2=0\) की जड़ें \(\alpha,\beta\) हैं, तो (\(\alpha+2\)\(\beta+2\)) का मान क्या है?

If \(\alpha,\beta\) are roots of \(x^2-4x+2=0\), what is (\(\alpha+2\)\(\beta+2\))?

Explanation opens after your attempt
Correct Answer

C. (14)

Step 1

Concept

(\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4). Since \(\alpha+\beta=4\) and \(\alpha\beta=2\), the value is (14).

Step 2

Why this answer is correct

The correct answer is C. (14). (\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4). Since \(\alpha+\beta=4\) and \(\alpha\beta=2\), the value is (14).

Step 3

Exam Tip

(\(\alpha+2\)\(\beta+2\)=\alpha\beta+2\(\alpha+\beta\)+4) है। \(\alpha+\beta=4\) और \(\alpha\beta=2\), इसलिए मान (14) है।

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\(x^2+6x+r=0\) की जड़ों का अंतर \(2\sqrt{5}\) है, तो (r) का मान क्या है?

If the difference between the roots of \(x^2+6x+r=0\) is \(2\sqrt{5}\), what is (r)?

Explanation opens after your attempt
Correct Answer

A. (4)

Step 1

Concept

Using (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta), we get (20=36-4r). Hence (r=4).

Step 2

Why this answer is correct

The correct answer is A. (4). Using (\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta), we get (20=36-4r). Hence (r=4).

Step 3

Exam Tip

(\(\alpha-\beta\)2=\(\alpha+\beta\)2-4\alpha\beta) से (20=36-4r) मिलता है। इसलिए (r=4)।

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यदि (x=0), \(ax^2+bx+c=0\) की जड़ है, तो कौन-सी शर्त निश्चित रूप से सही है?

If (x=0) is a root of \(ax^2+bx+c=0\), which condition must be true?

Explanation opens after your attempt
Correct Answer

A. (c=0)

Step 1

Concept

Putting (x=0) gives (c=0). Thus the direct condition for zero to be a root is (c=0).

Step 2

Why this answer is correct

The correct answer is A. (c=0). Putting (x=0) gives (c=0). Thus the direct condition for zero to be a root is (c=0).

Step 3

Exam Tip

(x=0) रखने पर समीकरण (c=0) बनता है। इसलिए शून्य जड़ होने की सीधी शर्त (c=0) है।

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\(4x^2-4x+1=0\) की दोनों जड़ों का मान क्या है?

What is the value of both roots of \(4x^2-4x+1=0\)?

Explanation opens after your attempt
Correct Answer

A. \(\frac{1}{2}\)

Step 1

Concept

(4x-2-4x+1=(2x-1)2). Therefore the equal root is \(x=\frac{1}{2}\).

Step 2

Why this answer is correct

The correct answer is A. \(\frac{1}{2}\). (4x-2-4x+1=(2x-1)2). Therefore the equal root is \(x=\frac{1}{2}\).

Step 3

Exam Tip

(4x-2-4x+1=(2x-1)2) है। इसलिए समान जड़ \(x=\frac{1}{2}\) है।

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\(x^2+3x-18=0\) की जड़ों का सही युग्म कौन-सा है?

Which is the correct pair of roots of \(x^2+3x-18=0\)?

Explanation opens after your attempt
Correct Answer

A. (3) और (-6)(3) and (-6)

Step 1

Concept

The numbers with product (-18) and sum (-3) are (3) and (-6). Hence this is the correct pair of roots.

Step 2

Why this answer is correct

The correct answer is A. (3) और (-6) / (3) and (-6). The numbers with product (-18) and sum (-3) are (3) and (-6). Hence this is the correct pair of roots.

Step 3

Exam Tip

गुणनफल (-18) और योग (-3) वाली संख्याएँ (3) और (-6) हैं। इसलिए यही जड़ों का सही युग्म है।

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\(x^2-sx+9=0\) की जड़ें समान और धनात्मक हों, तो (s) का मान क्या होगा?

If \(x^2-sx+9=0\) has equal and positive roots, what is (s)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

For equal roots, \(s^2-36=0\), so \(s=\pm6\). The equal root is \(\frac{s}{2}\), which is positive when (s=6).

Step 2

Why this answer is correct

The correct answer is A. (6). For equal roots, \(s^2-36=0\), so \(s=\pm6\). The equal root is \(\frac{s}{2}\), which is positive when (s=6).

Step 3

Exam Tip

समान जड़ों के लिए \(s^2-36=0\), इसलिए \(s=\pm6\)। समान जड़ \(\frac{s}{2}\) है, जो धनात्मक होने पर (s=6) देता है।

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((k-2)x-2+4x+1=0) की जड़ें समान हों, तो (k) का मान क्या है?

If ((k-2)x-2+4x+1=0) has equal roots, what is (k)?

Explanation opens after your attempt
Correct Answer

A. (6)

Step 1

Concept

For equal roots, put (D=0). From (16-4(k-2)=0), we get (k=6).

Step 2

Why this answer is correct

The correct answer is A. (6). For equal roots, put (D=0). From (16-4(k-2)=0), we get (k=6).

Step 3

Exam Tip

समान जड़ों के लिए (D=0) रखें। (16-4(k-2)=0) से (k=6) मिलता है।

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यदि \(x^2-6x+8=0\) की जड़ें \(\alpha,\beta\) हैं, तो (\(\alpha-2\)\(\beta-2\)) का मान क्या है?

If \(\alpha,\beta\) are roots of \(x^2-6x+8=0\), what is (\(\alpha-2\)\(\beta-2\))?

Explanation opens after your attempt
Correct Answer

A. (0)

Step 1

Concept

(\(\alpha-2\)\(\beta-2\)=\alpha\beta-2\(\alpha+\beta\)+4). Since \(\alpha+\beta=6\) and \(\alpha\beta=8\), the value is (0).

Step 2

Why this answer is correct

The correct answer is A. (0). (\(\alpha-2\)\(\beta-2\)=\alpha\beta-2\(\alpha+\beta\)+4). Since \(\alpha+\beta=6\) and \(\alpha\beta=8\), the value is (0).

Step 3

Exam Tip

(\(\alpha-2\)\(\beta-2\)=\alpha\beta-2\(\alpha+\beta\)+4) है। \(\alpha+\beta=6\) और \(\alpha\beta=8\), इसलिए मान (0) है।

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FAQs

Class 10 Mathematics Quiz FAQs

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