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Class 9 Mathematics Medium Quiz

Level 68 • 50/50 questions • 35 seconds per question.

Level readiness 50/50 Questions
Time Left 29:10 35 sec/question
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Question 1 / 50 0 score
Answered 0/50 Correct 0 Time 29:10

भुजा (x+3) वाले वर्ग के क्षेत्रफल मॉडल में चार भाग कौन-से होंगे?

In the area model of a square with side (x+3), what will be the four parts?

Explanation opens after your attempt
Correct Answer

A. \(x^2\), (3x), (3x), (9)correct parts

Step 1

Concept

Two rectangles (3x) and (3x) are formed and the small corner is (9). In exams split the square model into four parts.

Step 2

Why this answer is correct

The correct answer is A. \(x^2\), (3x), (3x), (9) / correct parts. Two rectangles (3x) and (3x) are formed and the small corner is (9). In exams split the square model into four parts.

Step 3

Exam Tip

दो आयत (3x) और (3x) बनते हैं और छोटा कोना (9) होता है। परीक्षा में वर्ग मॉडल को चार भागों में बांटें।

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यदि किसी मॉडल में \(y^2\), (8y), और (16) मिलकर पूर्ण वर्ग बनाते हैं तो बाहरी भुजा क्या होगी?

If \(y^2\), (8y), and (16) make a perfect square in a model, what will be the outer side?

Explanation opens after your attempt
Correct Answer

B. (y+4)correct side

Step 1

Concept

Since \(16=4^2\) and \(2\cdot y\cdot4=8y\), the side is (y+4). In exams take the square root of the last term.

Step 2

Why this answer is correct

The correct answer is B. (y+4) / correct side. Since \(16=4^2\) and \(2\cdot y\cdot4=8y\), the side is (y+4). In exams take the square root of the last term.

Step 3

Exam Tip

\(16=4^2\) और \(2\cdot y\cdot4=8y\), इसलिए भुजा (y+4) है। परीक्षा में अंतिम पद का वर्गमूल लें।

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भुजा (a-5) वाले वर्ग के घटाव मॉडल में अंतिम जोड़ा गया कोना कितना होगा?

In the subtraction model of a square with side (a-5), what is the final added corner?

Explanation opens after your attempt
Correct Answer

C. (25)overlap square

Step 1

Concept

When two (5a) strips are removed, the (5) by (5) corner is removed twice. In exams add back the overlap in a subtraction model.

Step 2

Why this answer is correct

The correct answer is C. (25) / overlap square. When two (5a) strips are removed, the (5) by (5) corner is removed twice. In exams add back the overlap in a subtraction model.

Step 3

Exam Tip

दो (5a) पट्टियां हटाने पर (5) बाय (5) कोना दो बार हटता है। परीक्षा में घटाव मॉडल में ओवरलैप वापस जोड़ें।

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आयत की भुजाएं (x+6) और (x-6) हैं। दृश्य मॉडल में क्षेत्रफल कौन-सा होगा?

A rectangle has sides (x+6) and (x-6). What will be the area in the visual model?

Explanation opens after your attempt
Correct Answer

D. \(x^2-36\)difference of squares

Step 1

Concept

The product of sum and difference gives \(x^2-36\). In exams use difference of squares when opposite signs appear.

Step 2

Why this answer is correct

The correct answer is D. \(x^2-36\) / difference of squares. The product of sum and difference gives \(x^2-36\). In exams use difference of squares when opposite signs appear.

Step 3

Exam Tip

योग और अंतर का गुणनफल \(x^2-36\) देता है। परीक्षा में विपरीत चिन्ह दिखें तो वर्गों का अंतर लगाएं।

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एक (p) बाय (p) वर्ग के साथ (2) चौड़ी दो पट्टियां और (2) बाय (2) कोना जोड़ा गया। नया क्षेत्रफल क्या है?

Two strips of width (2) and a (2) by (2) corner are added to a (p) by (p) square. What is the new area?

Explanation opens after your attempt
Correct Answer

A. \(p^2+4p+4\)complete area

Step 1

Concept

The two strips give (2p+2p=4p) and the corner gives (4). In exams add all the added parts.

Step 2

Why this answer is correct

The correct answer is A. \(p^2+4p+4\) / complete area. The two strips give (2p+2p=4p) and the corner gives (4). In exams add all the added parts.

Step 3

Exam Tip

दो पट्टियां (2p+2p=4p) और कोना (4) देते हैं। परीक्षा में जोड़े गए सभी भागों को जोड़ें।

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कौन-सा दृश्य विभाजन ((m+7)2) को सही दिखाता है?

Which visual partition correctly shows ((m+7)2)?

Explanation opens after your attempt
Correct Answer

C. \(m^2\), (7m), (7m), (49)correct partition

Step 1

Concept

A square of side (m+7) has two equal (7m) strips and a (49) corner. In exams identify equal strips.

Step 2

Why this answer is correct

The correct answer is C. \(m^2\), (7m), (7m), (49) / correct partition. A square of side (m+7) has two equal (7m) strips and a (49) corner. In exams identify equal strips.

Step 3

Exam Tip

भुजा (m+7) के वर्ग में दो समान (7m) पट्टियां और (49) कोना होता है। परीक्षा में समान पट्टियां पहचानें।

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एक छात्र ने ((x-4)2) का मॉडल \(x^2-16\) लिख दिया। कौन-सा भाग छूट गया?

A student wrote the model of ((x-4)2) as \(x^2-16\). Which part was missed?

Explanation opens after your attempt
Correct Answer

D. (-8x+32)correction difference

Step 1

Concept

The correct expansion is \(x^2-8x+16\), so the difference from \(x^2-16\) is (-8x+32). In exams keep square of difference and difference of squares separate.

Step 2

Why this answer is correct

The correct answer is D. (-8x+32) / correction difference. The correct expansion is \(x^2-8x+16\), so the difference from \(x^2-16\) is (-8x+32). In exams keep square of difference and difference of squares separate.

Step 3

Exam Tip

सही विस्तार \(x^2-8x+16\) है, इसलिए \(x^2-16\) से अंतर (-8x+32) है। परीक्षा में अंतर का वर्ग और वर्गों का अंतर अलग रखें।

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आयत मॉडल में \(x^2\), (2x), (9x), और (18) भाग हैं। भुजाएं कौन-सी हैं?

In a rectangle model, the parts are \(x^2\), (2x), (9x), and (18). What are the sides?

Explanation opens after your attempt
Correct Answer

B. (x+2) और (x+9)correct sides

Step 1

Concept

The strips (2x) and (9x) show the constant parts (2) and (9). In exams also check the corner product.

Step 2

Why this answer is correct

The correct answer is B. (x+2) और (x+9) / correct sides. The strips (2x) and (9x) show the constant parts (2) and (9). In exams also check the corner product.

Step 3

Exam Tip

पट्टियां (2x) और (9x) बताती हैं कि स्थिर भाग (2) और (9) हैं। परीक्षा में कोने का गुणनफल भी जांचें।

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भुजा (2x+5) वाले वर्ग के मॉडल में मुख्य वर्ग और छोटा कोना क्रमशः क्या होंगे?

In the model of a square with side (2x+5), what are the main square and small corner respectively?

Explanation opens after your attempt
Correct Answer

A. \(4x^2\) और (25)correct squares

Step 1

Concept

The main square is ((2x)2=4x-2) and the corner is \(5^2=25\). In exams square both side parts separately.

Step 2

Why this answer is correct

The correct answer is A. \(4x^2\) और (25) / correct squares. The main square is ((2x)2=4x-2) and the corner is \(5^2=25\). In exams square both side parts separately.

Step 3

Exam Tip

मुख्य वर्ग ((2x)2=4x-2) और कोना \(5^2=25\) है। परीक्षा में दोनों भुजाओं को अलग-अलग वर्ग करें।

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यदि ((3x+1)2) का दृश्य मॉडल बनाया जाए तो मध्य क्षेत्रफल कुल कितना होगा?

If the visual model of ((3x+1)2) is made, what is the total middle area?

Explanation opens after your attempt
Correct Answer

B. (6x)total middle area

Step 1

Concept

The middle area is \(2\cdot3x\cdot1=6x\). In exams use (2ab) for the middle part of a perfect square.

Step 2

Why this answer is correct

The correct answer is B. (6x) / total middle area. The middle area is \(2\cdot3x\cdot1=6x\). In exams use (2ab) for the middle part of a perfect square.

Step 3

Exam Tip

मध्य क्षेत्रफल \(2\cdot3x\cdot1=6x\) है। परीक्षा में पूर्ण वर्ग के मध्य भाग को (2ab) से निकालें।

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किस मॉडल में \(z^2-81\) को आयत में बदलकर दिखाया जा सकता है?

In which model can \(z^2-81\) be shown by changing it into a rectangle?

Explanation opens after your attempt
Correct Answer

A. भुजा (z) के वर्ग से भुजा (9) का वर्ग हटानाremove square of side (9) from square of side (z)

Step 1

Concept

Since \(81=9^2\), this is a model of removing a smaller square from a larger square. In exams understand difference of squares by cut and rearrange.

Step 2

Why this answer is correct

The correct answer is A. भुजा (z) के वर्ग से भुजा (9) का वर्ग हटाना / remove square of side (9) from square of side (z). Since \(81=9^2\), this is a model of removing a smaller square from a larger square. In exams understand difference of squares by cut and rearrange.

Step 3

Exam Tip

\(81=9^2\), इसलिए यह बड़े वर्ग से छोटे वर्ग को हटाने का मॉडल है। परीक्षा में वर्गों के अंतर को कट-और-जोड़ से समझें।

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दृश्य मॉडल में \(x^2+12x+36\) एक पूर्ण वर्ग है। समान आयतों में प्रत्येक का क्षेत्रफल क्या है?

In the visual model, \(x^2+12x+36\) is a perfect square. What is the area of each equal rectangle?

Explanation opens after your attempt
Correct Answer

C. (6x)each rectangle

Step 1

Concept

The total middle area is (12x), so each of the two equal rectangles is (6x). In exams split the middle term into two equal parts.

Step 2

Why this answer is correct

The correct answer is C. (6x) / each rectangle. The total middle area is (12x), so each of the two equal rectangles is (6x). In exams split the middle term into two equal parts.

Step 3

Exam Tip

कुल मध्य क्षेत्रफल (12x) है, इसलिए दो समान आयतों में प्रत्येक (6x) है। परीक्षा में मध्य पद को दो बराबर भागों में बांटें।

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आयत की भुजाएं (x+3) और (x+8) हैं। क्षेत्रफल मॉडल में स्थिर कोना कितना होगा?

A rectangle has sides (x+3) and (x+8). What will be the constant corner in the area model?

Explanation opens after your attempt
Correct Answer

B. (24)product of constants

Step 1

Concept

The constant corner is \(3\cdot8=24\). In exams multiply both constant parts for the small corner.

Step 2

Why this answer is correct

The correct answer is B. (24) / product of constants. The constant corner is \(3\cdot8=24\). In exams multiply both constant parts for the small corner.

Step 3

Exam Tip

स्थिर कोना \(3\cdot8=24\) होता है। परीक्षा में छोटे कोने के लिए दोनों स्थिर भागों का गुणा करें।

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कौन-सा मॉडल \(4a^2-12a+9\) को सही रूप से पूर्ण वर्ग दिखाता है?

Which model correctly shows \(4a^2-12a+9\) as a perfect square?

Explanation opens after your attempt
Correct Answer

C. भुजा (2a-3) वाला वर्गsquare of side (2a-3)

Step 1

Concept

(4a-2=(2a)2), \(9=3^2\), and the middle term is negative. In exams choose (+) or (-) by checking the sign.

Step 2

Why this answer is correct

The correct answer is C. भुजा (2a-3) वाला वर्ग / square of side (2a-3). (4a-2=(2a)2), \(9=3^2\), and the middle term is negative. In exams choose (+) or (-) by checking the sign.

Step 3

Exam Tip

(4a-2=(2a)2), \(9=3^2\), और मध्य पद ऋणात्मक है। परीक्षा में चिन्ह देखकर (+) या (-) चुनें।

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यदि बड़े वर्ग का क्षेत्रफल \(x^2\) और हटाए गए छोटे वर्ग का क्षेत्रफल (49) है तो शेष आयत की भुजाएं क्या होंगी?

If the large square area is \(x^2\) and the removed small square area is (49), what will be the sides of the remaining rectangle?

Explanation opens after your attempt
Correct Answer

A. (x-7) और (x+7)correct rearranged sides

Step 1

Concept

Since \(49=7^2\), (x-2-49=(x-7)(x+7)). In exams take the smaller square side as (7).

Step 2

Why this answer is correct

The correct answer is A. (x-7) और (x+7) / correct rearranged sides. Since \(49=7^2\), (x-2-49=(x-7)(x+7)). In exams take the smaller square side as (7).

Step 3

Exam Tip

\(49=7^2\), इसलिए (x-2-49=(x-7)(x+7)) है। परीक्षा में छोटे वर्ग की भुजा (7) लें।

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भुजा (n+4) वाले वर्ग में केवल \(n^2\) और (16) लिखे गए। कौन-सा कुल क्षेत्रफल छूट गया?

In a square with side (n+4), only \(n^2\) and (16) are written. What total area is missing?

Explanation opens after your attempt
Correct Answer

B. (8n)two strips

Step 1

Concept

Two (4n) strips are missing, so the total missing area is (8n). In exams do not omit the middle term in ((n+4)2).

Step 2

Why this answer is correct

The correct answer is B. (8n) / two strips. Two (4n) strips are missing, so the total missing area is (8n). In exams do not omit the middle term in ((n+4)2).

Step 3

Exam Tip

दो (4n) पट्टियां छूटी हैं, इसलिए कुल छूटा क्षेत्रफल (8n) है। परीक्षा में ((n+4)2) में मध्य पद न छोड़ें।

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एक ग्रिड मॉडल में पंक्तियां (x) और (5), स्तंभ (x) और (2) हैं। कुल क्षेत्रफल क्या होगा?

In a grid model, the rows are (x) and (5), and the columns are (x) and (2). What will be the total area?

Explanation opens after your attempt
Correct Answer

A. \(x^2+7x+10\)correct total

Step 1

Concept

The four cells are \(x^2\), (2x), (5x), and (10), whose sum is \(x^2+7x+10\). In exams multiply every cell.

Step 2

Why this answer is correct

The correct answer is A. \(x^2+7x+10\) / correct total. The four cells are \(x^2\), (2x), (5x), and (10), whose sum is \(x^2+7x+10\). In exams multiply every cell.

Step 3

Exam Tip

चार खाने \(x^2\), (2x), (5x), और (10) हैं जिनका योग \(x^2+7x+10\) है। परीक्षा में हर खाने का गुणन करें।

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किस क्षेत्रफल मॉडल से \(98^2\) को सरलता से देखा जा सकता है?

Which area model can show \(98^2\) easily?

Explanation opens after your attempt
Correct Answer

A. ((100-2)2)subtraction square model

Step 1

Concept

Since (98=100-2), the subtraction square model gives quick calculation. In exams use the nearest round number.

Step 2

Why this answer is correct

The correct answer is A. ((100-2)2) / subtraction square model. Since (98=100-2), the subtraction square model gives quick calculation. In exams use the nearest round number.

Step 3

Exam Tip

(98=100-2), इसलिए घटाव वर्ग मॉडल तेज गणना देता है। परीक्षा में निकटतम पूर्ण संख्या का उपयोग करें।

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भुजा (x-2) वाले वर्ग के मॉडल में \(x^2\) से कुल कितना आयताकार क्षेत्र घटता है?

In the model of a square with side (x-2), how much rectangular area is subtracted from \(x^2\) in total?

Explanation opens after your attempt
Correct Answer

B. (4x)two strips

Step 1

Concept

Two (2x) strips are removed, so the total removed rectangular area is (4x). In exams count both removed strips.

Step 2

Why this answer is correct

The correct answer is B. (4x) / two strips. Two (2x) strips are removed, so the total removed rectangular area is (4x). In exams count both removed strips.

Step 3

Exam Tip

दो (2x) पट्टियां घटती हैं, इसलिए कुल घटा आयताकार क्षेत्र (4x) है। परीक्षा में घटाई गई दोनों पट्टियां गिनें।

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यदि एक आयत का क्षेत्रफल मॉडल \(x^2+10x+21\) है तो कौन-सी भुजाएं सही होंगी?

If a rectangle area model is \(x^2+10x+21\), which sides will be correct?

Explanation opens after your attempt
Correct Answer

B. (x+3) और (x+7)correct factors

Step 1

Concept

Since (3+7=10) and \(3\cdot7=21\), the sides are (x+3) and (x+7). In exams check both sum and product.

Step 2

Why this answer is correct

The correct answer is B. (x+3) और (x+7) / correct factors. Since (3+7=10) and \(3\cdot7=21\), the sides are (x+3) and (x+7). In exams check both sum and product.

Step 3

Exam Tip

(3+7=10) और \(3\cdot7=21\), इसलिए भुजाएं (x+3) और (x+7) हैं। परीक्षा में योग और गुणनफल दोनों देखें।

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कौन-सा दृश्य मॉडल \(9r^2-16\) के लिए सही है?

Which visual model is correct for \(9r^2-16\)?

Explanation opens after your attempt
Correct Answer

A. भुजा (3r) के वर्ग से भुजा (4) का वर्ग हटानाremove square of side (4) from square of side (3r)

Step 1

Concept

(9r-2=(3r)2) and \(16=4^2\), so it is a difference of squares. In exams first identify square roots.

Step 2

Why this answer is correct

The correct answer is A. भुजा (3r) के वर्ग से भुजा (4) का वर्ग हटाना / remove square of side (4) from square of side (3r). (9r-2=(3r)2) and \(16=4^2\), so it is a difference of squares. In exams first identify square roots.

Step 3

Exam Tip

(9r-2=(3r)2) और \(16=4^2\), इसलिए यह वर्गों का अंतर है। परीक्षा में पहले वर्गमूल पहचानें।

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भुजा (x+1) और (x+9) वाले आयत में मध्य पट्टियों का योग क्या होगा?

In a rectangle with sides (x+1) and (x+9), what will be the sum of middle strips?

Explanation opens after your attempt
Correct Answer

B. (10x)correct middle sum

Step 1

Concept

The middle strips are (x) and (9x), whose sum is (10x). In exams add both strips.

Step 2

Why this answer is correct

The correct answer is B. (10x) / correct middle sum. The middle strips are (x) and (9x), whose sum is (10x). In exams add both strips.

Step 3

Exam Tip

मध्य पट्टियां (x) और (9x) हैं जिनका योग (10x) है। परीक्षा में दोनों पट्टियां जोड़ें।

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दृश्य मॉडल में \(16x^2+24x+9\) एक पूर्ण वर्ग बनता है। इसकी भुजा क्या है?

In a visual model, \(16x^2+24x+9\) forms a perfect square. What is its side?

Explanation opens after your attempt
Correct Answer

B. (4x+3)correct side

Step 1

Concept

(16x-2=(4x)2) and \(9=3^2\), so the side is (4x+3). In exams add the roots of both squares.

Step 2

Why this answer is correct

The correct answer is B. (4x+3) / correct side. (16x-2=(4x)2) and \(9=3^2\), so the side is (4x+3). In exams add the roots of both squares.

Step 3

Exam Tip

(16x-2=(4x)2) और \(9=3^2\), इसलिए भुजा (4x+3) है। परीक्षा में दोनों वर्गों की जड़ जोड़ें।

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एक बड़े वर्ग से \(b^2\) हटाने पर शेष क्षेत्रफल \(a^2-b^2\) है। इसे किस गुणनफल से दिखाएंगे?

When \(b^2\) is removed from a large square, the remaining area is \(a^2-b^2\). Which product represents it?

Explanation opens after your attempt
Correct Answer

C. (a+b) और (a-b) का गुणनफलproduct of sum and difference

Step 1

Concept

After rearranging the cut area into a rectangle, the sides are (a+b) and (a-b). In exams do not confuse it with square of difference.

Step 2

Why this answer is correct

The correct answer is C. (a+b) और (a-b) का गुणनफल / product of sum and difference. After rearranging the cut area into a rectangle, the sides are (a+b) and (a-b). In exams do not confuse it with square of difference.

Step 3

Exam Tip

कटे हुए क्षेत्र को आयत में बदलने पर भुजाएं (a+b) और (a-b) होती हैं। परीक्षा में अंतर के वर्ग से इसे न मिलाएं।

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किस मॉडल में \(x^2-6x+9\) को देखा जा सकता है?

In which model can \(x^2-6x+9\) be seen?

Explanation opens after your attempt
Correct Answer

B. भुजा (x-3) वाला वर्गsquare of side (x-3)

Step 1

Concept

(x-2-6x+9=(x-3)2). In exams see (9) as \(3^2\) and the middle as \(-2\cdot x\cdot3\).

Step 2

Why this answer is correct

The correct answer is B. भुजा (x-3) वाला वर्ग / square of side (x-3). (x-2-6x+9=(x-3)2). In exams see (9) as \(3^2\) and the middle as \(-2\cdot x\cdot3\).

Step 3

Exam Tip

(x-2-6x+9=(x-3)2) है। परीक्षा में अंतिम (9) को \(3^2\) और मध्य को \(-2\cdot x\cdot3\) देखें।

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एक टाइल मॉडल में \(x^2\), (-4x), (7x), और (-28) हैं। कुल क्षेत्रफल क्या है?

A tile model has \(x^2\), (-4x), (7x), and (-28). What is the total area?

Explanation opens after your attempt
Correct Answer

A. \(x^2+3x-28\)correct signed sum

Step 1

Concept

The middle term is (-4x+7x=3x), and the corner remains (-28). In exams add with signs.

Step 2

Why this answer is correct

The correct answer is A. \(x^2+3x-28\) / correct signed sum. The middle term is (-4x+7x=3x), and the corner remains (-28). In exams add with signs.

Step 3

Exam Tip

मध्य पद (-4x+7x=3x) है और कोना (-28) रहता है। परीक्षा में चिन्ह सहित जोड़ करें।

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यदि ((x+5)2-(x-5)2) को दो वर्गों के अंतर से दिखाएं तो बचा क्षेत्रफल कितना है?

If ((x+5)2-(x-5)2) is shown by the difference of two squares, what is the remaining area?

Explanation opens after your attempt
Correct Answer

B. (20x)correct strip area

Step 1

Concept

Expanding both squares leaves (20x). In exams cancel equal \(x^2\) and (25) terms.

Step 2

Why this answer is correct

The correct answer is B. (20x) / correct strip area. Expanding both squares leaves (20x). In exams cancel equal \(x^2\) and (25) terms.

Step 3

Exam Tip

दोनों वर्ग फैलाने पर (20x) बचता है। परीक्षा में समान \(x^2\) और (25) पद काट दें।

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भुजा (2u-1) वाले वर्ग के क्षेत्रफल मॉडल का विस्तार कौन-सा है?

What is the expansion of the area model of a square with side (2u-1)?

Explanation opens after your attempt
Correct Answer

A. \(4u^2-4u+1\)correct expansion

Step 1

Concept

The middle part is \(2\cdot2u\cdot1=4u\) and its sign is negative. In exams take the total of both equal strips.

Step 2

Why this answer is correct

The correct answer is A. \(4u^2-4u+1\) / correct expansion. The middle part is \(2\cdot2u\cdot1=4u\) and its sign is negative. In exams take the total of both equal strips.

Step 3

Exam Tip

मध्य भाग \(2\cdot2u\cdot1=4u\) है और चिन्ह ऋणात्मक है। परीक्षा में दोनों समान पट्टियों का कुल लें।

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आयत मॉडल \(x^2+5x+6\) में कौन-सी दो पट्टियां होंगी?

Which two strips will be in the rectangle model \(x^2+5x+6\)?

Explanation opens after your attempt
Correct Answer

B. (2x) और (3x)correct strips

Step 1

Concept

Since (2+3=5) and \(2\cdot3=6\), the strips are (2x) and (3x). In exams split the middle term into the correct two parts.

Step 2

Why this answer is correct

The correct answer is B. (2x) और (3x) / correct strips. Since (2+3=5) and \(2\cdot3=6\), the strips are (2x) and (3x). In exams split the middle term into the correct two parts.

Step 3

Exam Tip

(2+3=5) और \(2\cdot3=6\), इसलिए पट्टियां (2x) और (3x) हैं। परीक्षा में मध्य पद को सही दो भागों में बांटें।

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किस दृश्य मॉडल में \(a^2+2ab+b^2\) और ((a+b)2) एक ही क्षेत्रफल दिखाते हैं?

In which visual model do \(a^2+2ab+b^2\) and ((a+b)2) show the same area?

Explanation opens after your attempt
Correct Answer

A. भुजा (a+b) वाला वर्गsquare of side (a+b)

Step 1

Concept

A square of side (a+b) splits into four parts \(a^2\), (ab), (ab), and \(b^2\). In exams identify the whole outer square.

Step 2

Why this answer is correct

The correct answer is A. भुजा (a+b) वाला वर्ग / square of side (a+b). A square of side (a+b) splits into four parts \(a^2\), (ab), (ab), and \(b^2\). In exams identify the whole outer square.

Step 3

Exam Tip

भुजा (a+b) का वर्ग चार भागों \(a^2\), (ab), (ab), \(b^2\) में बंटता है। परीक्षा में पूरा बाहरी वर्ग पहचानें।

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भुजा (x-7) वाले वर्ग के मॉडल में कौन-सा विस्तार सही है?

Which expansion is correct in the model of a square with side (x-7)?

Explanation opens after your attempt
Correct Answer

B. \(x^2-14x+49\)correct model

Step 1

Concept

Two (7x) strips are removed and the (49) corner is added. In exams remember the middle term (-2ab).

Step 2

Why this answer is correct

The correct answer is B. \(x^2-14x+49\) / correct model. Two (7x) strips are removed and the (49) corner is added. In exams remember the middle term (-2ab).

Step 3

Exam Tip

दो (7x) पट्टियां घटती हैं और (49) कोना जुड़ता है। परीक्षा में (-2ab) मध्य पद याद रखें।

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एक (x+4) बाय (x+6) आयत की तुलना (x+5) बाय (x+5) वर्ग से की गई। कौन-सा क्षेत्रफल बड़ा है?

An (x+4) by (x+6) rectangle is compared with an (x+5) by (x+5) square. Which area is larger?

Explanation opens after your attempt
Correct Answer

B. वर्ग (1) से बड़ा हैsquare is larger by (1)

Step 1

Concept

The rectangle is \(x^2+10x+24\) and the square is \(x^2+10x+25\). In exams cancel common parts and compare the difference.

Step 2

Why this answer is correct

The correct answer is B. वर्ग (1) से बड़ा है / square is larger by (1). The rectangle is \(x^2+10x+24\) and the square is \(x^2+10x+25\). In exams cancel common parts and compare the difference.

Step 3

Exam Tip

आयत \(x^2+10x+24\) और वर्ग \(x^2+10x+25\) है। परीक्षा में समान भाग काटकर अंतर देखें।

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यदि \(x^2+16x+64\) का वर्ग मॉडल है तो बाहरी भुजा क्या होगी?

If \(x^2+16x+64\) is a square model, what is the outer side?

Explanation opens after your attempt
Correct Answer

B. (x+8)correct side

Step 1

Concept

\(64=8^2\) and the middle \(16x=2\cdot x\cdot8\). In exams find the constant side from the last term.

Step 2

Why this answer is correct

The correct answer is B. (x+8) / correct side. \(64=8^2\) and the middle \(16x=2\cdot x\cdot8\). In exams find the constant side from the last term.

Step 3

Exam Tip

\(64=8^2\) और मध्य \(16x=2\cdot x\cdot8\) है। परीक्षा में अंतिम पद से स्थिर भुजा निकालें।

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किस मॉडल में \(25-y^2\) को वर्गों के अंतर के रूप में दिखाया जा सकता है?

In which model can \(25-y^2\) be shown as a difference of squares?

Explanation opens after your attempt
Correct Answer

A. भुजा (5) वाले वर्ग से भुजा (y) वाला वर्ग हटानाremove square of side (y) from square of side (5)

Step 1

Concept

Since \(25=5^2\), (25-y-2=(5-y)(5+y)). In exams identify the side of the numerical square.

Step 2

Why this answer is correct

The correct answer is A. भुजा (5) वाले वर्ग से भुजा (y) वाला वर्ग हटाना / remove square of side (y) from square of side (5). Since \(25=5^2\), (25-y-2=(5-y)(5+y)). In exams identify the side of the numerical square.

Step 3

Exam Tip

\(25=5^2\), इसलिए (25-y-2=(5-y)(5+y)) है। परीक्षा में संख्या वर्ग की भुजा पहचानें।

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एक आयत मॉडल में भुजाएं (2x+3) और (x+4) हैं। कुल क्षेत्रफल क्या होगा?

A rectangle model has sides (2x+3) and (x+4). What will be the total area?

Explanation opens after your attempt
Correct Answer

A. \(2x^2+11x+12\)correct total

Step 1

Concept

The cells are \(2x^2\), (8x), (3x), and (12), whose sum is \(2x^2+11x+12\). In exams add all four cells.

Step 2

Why this answer is correct

The correct answer is A. \(2x^2+11x+12\) / correct total. The cells are \(2x^2\), (8x), (3x), and (12), whose sum is \(2x^2+11x+12\). In exams add all four cells.

Step 3

Exam Tip

खाने \(2x^2\), (8x), (3x), और (12) हैं जिनका योग \(2x^2+11x+12\) है। परीक्षा में चारों खाने जोड़ें।

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भुजा (3x-2) वाले वर्ग में छोटा कोना और मध्य क्षेत्रफल क्या होंगे?

In a square with side (3x-2), what will be the small corner and the middle area?

Explanation opens after your attempt
Correct Answer

A. (4) और (-12x)correct values

Step 1

Concept

The corner is \(2^2=4\) and the middle area is \(-2\cdot3x\cdot2=-12x\). In exams pay attention to the subtraction sign.

Step 2

Why this answer is correct

The correct answer is A. (4) और (-12x) / correct values. The corner is \(2^2=4\) and the middle area is \(-2\cdot3x\cdot2=-12x\). In exams pay attention to the subtraction sign.

Step 3

Exam Tip

कोना \(2^2=4\) और मध्य क्षेत्रफल \(-2\cdot3x\cdot2=-12x\) है। परीक्षा में घटाव चिन्ह पर ध्यान दें।

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किस दृश्य मॉडल से \(x^2+18x+80\) का गुणनखंड मिल सकता है?

Which visual model can give the factorization of \(x^2+18x+80\)?

Explanation opens after your attempt
Correct Answer

A. भुजाएं (x+8) और (x+10) वाला आयतrectangle with sides (x+8) and (x+10)

Step 1

Concept

Since (8+10=18) and \(8\cdot10=80\), this is the correct rectangle model. In exams match both the middle and constant terms.

Step 2

Why this answer is correct

The correct answer is A. भुजाएं (x+8) और (x+10) वाला आयत / rectangle with sides (x+8) and (x+10). Since (8+10=18) and \(8\cdot10=80\), this is the correct rectangle model. In exams match both the middle and constant terms.

Step 3

Exam Tip

(8+10=18) और \(8\cdot10=80\), इसलिए यही सही आयत मॉडल है। परीक्षा में मध्य और स्थिर पद दोनों मिलाएं।

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यदि ((x+2)2) और ((x+2)(x-2)) के मॉडल की तुलना करें तो पहले का क्षेत्रफल दूसरे से कितना अधिक है?

If the models of ((x+2)2) and ((x+2)(x-2)) are compared, how much greater is the first area than the second?

Explanation opens after your attempt
Correct Answer

A. (4x+8)correct difference

Step 1

Concept

((x+2)2=x-2+4x+4) and ((x+2)(x-2)=x-2-4), so the difference is (4x+8). In exams expand both models separately.

Step 2

Why this answer is correct

The correct answer is A. (4x+8) / correct difference. ((x+2)2=x-2+4x+4) and ((x+2)(x-2)=x-2-4), so the difference is (4x+8). In exams expand both models separately.

Step 3

Exam Tip

((x+2)2=x-2+4x+4) और ((x+2)(x-2)=x-2-4), इसलिए अंतर (4x+8) है। परीक्षा में दोनों मॉडल अलग-अलग फैलाएं।

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एक वर्ग मॉडल में \(x^2\), (kx), (kx), और (36) हैं। यदि पूर्ण वर्ग की भुजा (x+6) है तो (k) क्या है?

A square model has \(x^2\), (kx), (kx), and (36). If the perfect square side is (x+6), what is (k)?

Explanation opens after your attempt
Correct Answer

C. (6)each strip coefficient

Step 1

Concept

Each equal strip is (6x), so (k=6). In exams distinguish total middle term from each strip.

Step 2

Why this answer is correct

The correct answer is C. (6) / each strip coefficient. Each equal strip is (6x), so (k=6). In exams distinguish total middle term from each strip.

Step 3

Exam Tip

हर समान पट्टी (6x) है, इसलिए (k=6) है। परीक्षा में कुल मध्य पद और अलग पट्टी में फर्क रखें।

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भुजा (a+2b) वाले वर्ग में (b) से जुड़े कुल आयताकार क्षेत्रफल कितना होगा?

In a square with side (a+2b), what will be the total rectangular area involving (b)?

Explanation opens after your attempt
Correct Answer

B. (4ab)correct rectangular area

Step 1

Concept

The total of two rectangles is \(2\cdot a\cdot2b=4ab\). In exams treat (2b) as the whole second part.

Step 2

Why this answer is correct

The correct answer is B. (4ab) / correct rectangular area. The total of two rectangles is \(2\cdot a\cdot2b=4ab\). In exams treat (2b) as the whole second part.

Step 3

Exam Tip

दो आयतों का कुल \(2\cdot a\cdot2b=4ab\) है। परीक्षा में (2b) को पूरा दूसरा भाग मानें।

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किस दृश्य पहचान से \(51^2-49^2\) जल्दी निकलेगा?

Which visual identity quickly gives \(51^2-49^2\)?

Explanation opens after your attempt
Correct Answer

A. वर्गों का अंतर ( (51-49)(51+49) )difference of squares

Step 1

Concept

It is \(2\cdot100=200\). In exams view the difference of two nearby squares as a rectangle.

Step 2

Why this answer is correct

The correct answer is A. वर्गों का अंतर ( (51-49)(51+49) ) / difference of squares. It is \(2\cdot100=200\). In exams view the difference of two nearby squares as a rectangle.

Step 3

Exam Tip

यह \(2\cdot100=200\) है। परीक्षा में दो नजदीकी वर्गों के अंतर को आयत के रूप में देखें।

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यदि \(x^2-2x-24\) को टाइल आयत से बनाना हो तो कौन-सी भुजाएं सही हैं?

If \(x^2-2x-24\) is to be made by a tile rectangle, which sides are correct?

Explanation opens after your attempt
Correct Answer

A. (x+4) और (x-6)correct signed sides

Step 1

Concept

Here (4+(-6)=-2) and (4\cdot(-6)=-24). In exams choose opposite signs for a negative corner.

Step 2

Why this answer is correct

The correct answer is A. (x+4) और (x-6) / correct signed sides. Here (4+(-6)=-2) and (4\cdot(-6)=-24). In exams choose opposite signs for a negative corner.

Step 3

Exam Tip

(4+(-6)=-2) और (4\cdot(-6)=-24) है। परीक्षा में ऋणात्मक कोने के लिए विपरीत चिन्ह चुनें।

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एक दृश्य मॉडल में \(x^2+6x+5\) और \(x^2+6x+9\) दिखाए गए। दूसरा पहले से कितना अधिक है?

A visual model shows \(x^2+6x+5\) and \(x^2+6x+9\). How much greater is the second than the first?

Explanation opens after your attempt
Correct Answer

C. (4)constant difference

Step 1

Concept

Both have \(x^2+6x\) common, and the difference of constants is (4). In exams compare after removing common regions.

Step 2

Why this answer is correct

The correct answer is C. (4) / constant difference. Both have \(x^2+6x\) common, and the difference of constants is (4). In exams compare after removing common regions.

Step 3

Exam Tip

दोनों में \(x^2+6x\) समान है और स्थिर पदों का अंतर (4) है। परीक्षा में समान क्षेत्रों को हटाकर तुलना करें।

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किस वर्ग मॉडल में \(9x^2+30x+25\) दिखाई देगा?

In which square model will \(9x^2+30x+25\) appear?

Explanation opens after your attempt
Correct Answer

A. भुजा (3x+5) वाला वर्गsquare of side (3x+5)

Step 1

Concept

(9x-2=(3x)2), \(25=5^2\), and the middle is (30x). In exams form the side from the roots of squares.

Step 2

Why this answer is correct

The correct answer is A. भुजा (3x+5) वाला वर्ग / square of side (3x+5). (9x-2=(3x)2), \(25=5^2\), and the middle is (30x). In exams form the side from the roots of squares.

Step 3

Exam Tip

(9x-2=(3x)2), \(25=5^2\), और मध्य (30x) है। परीक्षा में वर्गों की जड़ से भुजा बनाएं।

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भुजा (x+6) वाले वर्ग से भुजा (x) वाले वर्ग को हटाने पर बचा क्षेत्रफल क्या है?

What area remains when a square of side (x) is removed from a square of side (x+6)?

Explanation opens after your attempt
Correct Answer

A. (12x+36)correct remaining area

Step 1

Concept

((x+6)2-x-2=12x+36). In exams subtract the smaller square area from the larger square.

Step 2

Why this answer is correct

The correct answer is A. (12x+36) / correct remaining area. ((x+6)2-x-2=12x+36). In exams subtract the smaller square area from the larger square.

Step 3

Exam Tip

((x+6)2-x-2=12x+36) है। परीक्षा में बड़े वर्ग से छोटे वर्ग का क्षेत्रफल घटाएं।

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यदि आयत मॉडल की भुजाएं (x-3) और (x+9) हैं तो कुल क्षेत्रफल क्या होगा?

If the sides of a rectangle model are (x-3) and (x+9), what will be the total area?

Explanation opens after your attempt
Correct Answer

A. \(x^2+6x-27\)correct signed product

Step 1

Concept

The middle strips are (9x) and (-3x), whose sum is (6x). In exams subtract the negative strip.

Step 2

Why this answer is correct

The correct answer is A. \(x^2+6x-27\) / correct signed product. The middle strips are (9x) and (-3x), whose sum is (6x). In exams subtract the negative strip.

Step 3

Exam Tip

मध्य पट्टियां (9x) और (-3x) हैं, जिनका योग (6x) है। परीक्षा में ऋणात्मक पट्टी को घटाएं।

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कौन-सा मॉडल ((x+y)2-y-2) को सरल करता है?

Which model simplifies ((x+y)2-y-2)?

Explanation opens after your attempt
Correct Answer

A. भुजा (x+y) के वर्ग से भुजा (y) का वर्ग हटानाremove square of side (y) from square of side (x+y)

Step 1

Concept

This is a difference of squares and the area becomes (x(x+2y)). In exams rearrange the remaining part into a rectangle after removing the small square.

Step 2

Why this answer is correct

The correct answer is A. भुजा (x+y) के वर्ग से भुजा (y) का वर्ग हटाना / remove square of side (y) from square of side (x+y). This is a difference of squares and the area becomes (x(x+2y)). In exams rearrange the remaining part into a rectangle after removing the small square.

Step 3

Exam Tip

यह वर्गों का अंतर है और क्षेत्रफल (x(x+2y)) बनता है। परीक्षा में हटे छोटे वर्ग के बाद बचे भाग को आयत में बदलें।

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एक आयत मॉडल \(2x^2+9x+10\) दिखाता है। सही भुजाएं कौन-सी हैं?

A rectangle model shows \(2x^2+9x+10\). Which sides are correct?

Explanation opens after your attempt
Correct Answer

A. (2x+5) और (x+2)correct factors

Step 1

Concept

((2x+5)(x+2)=2x-2+4x+5x+10). In exams the sum of cross strips should be (9x).

Step 2

Why this answer is correct

The correct answer is A. (2x+5) और (x+2) / correct factors. ((2x+5)(x+2)=2x-2+4x+5x+10). In exams the sum of cross strips should be (9x).

Step 3

Exam Tip

((2x+5)(x+2)=2x-2+4x+5x+10) है। परीक्षा में क्रॉस पट्टियों का योग (9x) होना चाहिए।

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भुजा (x-1) वाले वर्ग और भुजा (x+1) वाले वर्ग के क्षेत्रफलों का अंतर कितना है?

What is the difference between the areas of squares with sides (x-1) and (x+1)?

Explanation opens after your attempt
Correct Answer

B. (4x)correct absolute difference

Step 1

Concept

((x+1)2-(x-1)2=4x). In exams subtract the smaller square from the larger square.

Step 2

Why this answer is correct

The correct answer is B. (4x) / correct absolute difference. ((x+1)2-(x-1)2=4x). In exams subtract the smaller square from the larger square.

Step 3

Exam Tip

((x+1)2-(x-1)2=4x) है। परीक्षा में बड़े वर्ग से छोटे वर्ग को घटाएं।

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यदि \(x^2+2xy+y^2\) के मॉडल में \(x^2\) और \(y^2\) दो कोनों पर हैं, तो शेष दो भाग क्या होंगे?

If in the model of \(x^2+2xy+y^2\), \(x^2\) and \(y^2\) are at two corners, what will the remaining two parts be?

Explanation opens after your attempt
Correct Answer

C. (xy) और (xy)equal rectangles

Step 1

Concept

The remaining two parts are (xy) and (xy), whose sum is (2xy). In exams see the middle term as two equal rectangles.

Step 2

Why this answer is correct

The correct answer is C. (xy) और (xy) / equal rectangles. The remaining two parts are (xy) and (xy), whose sum is (2xy). In exams see the middle term as two equal rectangles.

Step 3

Exam Tip

शेष दो भाग (xy) और (xy) होते हैं, जिनका योग (2xy) है। परीक्षा में मध्य पद को दो समान आयतों में देखें।

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Class 9 Mathematics Quiz FAQs

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