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minus MCQ Questions for Class 9

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Question 1/5 Hard Mathematics Exploring Algebraic Identities Quadratic expressions Class 9 Level 73

\(x^2-18x+81\) का पूर्ण वर्ग रूप क्या है?

What is the perfect square form of \(x^2-18x+81\)?

Explanation opens after your attempt
Correct Answer

A. ((x-9)2)

Step 1

Concept

\(81=9^2\) and \(-18x=-2\cdot x\cdot9\). In exams, identify the subtraction square from the negative middle term.

Step 2

Why this answer is correct

The correct answer is A. ((x-9)2). \(81=9^2\) and \(-18x=-2\cdot x\cdot9\). In exams, identify the subtraction square from the negative middle term.

Step 3

Exam Tip

\(81=9^2\) और \(-18x=-2\cdot x\cdot9\) है। परीक्षा में ऋण मध्य पद से घटाव वाला वर्ग पहचानें।

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Question 2/5 Medium Mathematics Introduction to Polynomials Algebraic expressions Class 9 Level 24

(3(4x-5)-2(2x+1)) को सरल करने पर क्या मिलेगा?

What is obtained after simplifying (3(4x-5)-2(2x+1))?

Explanation opens after your attempt
Correct Answer

B. (8x-17)

Step 1

Concept

Expanding gives (12x-15-4x-2). Combining like terms gives (8x-17).

Step 2

Why this answer is correct

The correct answer is B. (8x-17). Expanding gives (12x-15-4x-2). Combining like terms gives (8x-17).

Step 3

Exam Tip

खोलने पर (12x-15-4x-2) मिलता है। समान पद मिलाकर (8x-17) बनेगा।

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Question 3/5 Easy Mathematics Introduction to Polynomials Algebraic expressions Class 9 Level 26

(3(y-2)) को खोलने पर सही रूप कौन-सा है?

Which is the correct expanded form of (3(y-2))?

Explanation opens after your attempt
Correct Answer

C. (3y-6)

Step 1

Concept

Multiply (3) by both (y) and (-2). This gives (3y-6).

Step 2

Why this answer is correct

The correct answer is C. (3y-6). Multiply (3) by both (y) and (-2). This gives (3y-6).

Step 3

Exam Tip

(3) को (y) और (-2) दोनों से गुणा करें। इससे (3y-6) मिलता है।

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Question 4/5 Hard Mathematics Number Systems Real Numbers Class 9 Level 2

( \(6\sqrt{5}-\sqrt{7}\)2 ) का सरल रूप क्या है?

What is the simplified form of ( \(6\sqrt{5}-\sqrt{7}\)2 )?

Explanation opens after your attempt
Correct Answer

A. \(187-12\sqrt{35}\)

Step 1

Concept

( \(6\sqrt{5}\)2=180 ) and ( \(\sqrt{7}\)2=7 ). The middle term \(12\sqrt{35}\) is subtracted.

Step 2

Why this answer is correct

The correct answer is A. \(187-12\sqrt{35}\). ( \(6\sqrt{5}\)2=180 ) and ( \(\sqrt{7}\)2=7 ). The middle term \(12\sqrt{35}\) is subtracted.

Step 3

Exam Tip

( \(6\sqrt{5}\)2=180 ) और ( \(\sqrt{7}\)2=7 ) हैं। मध्य पद \(12\sqrt{35}\) घटेगा।

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Question 5/5 Hard Mathematics Number Systems Real Numbers Class 9 Level 1

( \(5\sqrt{3}-2\sqrt{5}\)2 ) का सरल रूप क्या है?

What is the simplified form of ( \(5\sqrt{3}-2\sqrt{5}\)2 )?

Explanation opens after your attempt
Correct Answer

A. \(95-20\sqrt{15}\)

Step 1

Concept

( \(5\sqrt{3}\)2=75 ) and ( \(2\sqrt{5}\)2=20 ). The middle term \(2\times5\sqrt{3}\times2\sqrt{5}=20\sqrt{15}\) is subtracted.

Step 2

Why this answer is correct

The correct answer is A. \(95-20\sqrt{15}\). ( \(5\sqrt{3}\)2=75 ) and ( \(2\sqrt{5}\)2=20 ). The middle term \(2\times5\sqrt{3}\times2\sqrt{5}=20\sqrt{15}\) is subtracted.

Step 3

Exam Tip

( \(5\sqrt{3}\)2=75 ) और ( \(2\sqrt{5}\)2=20 ) हैं। मध्य पद \(2\times5\sqrt{3}\times2\sqrt{5}=20\sqrt{15}\) घटेगा।

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