Class 9 Mathematics - Introduction to Polynomials - Definition of polynomial Hard Quiz

Mathematics Introduction to Polynomials Definition of polynomial Hard Class 9 Level 24

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Question 1/2 Hard Mathematics Introduction to Polynomials Algebraic expressions Class 9 Level 24

किस विकल्प में \(x^2-3x+2\) और \(2x^2+x-5\) का योग सही है?

Which option gives the correct sum of \(x^2-3x+2\) and \(2x^2+x-5\)?

Explanation opens after your attempt
Correct Answer

A. \(3x^2-2x-3\)

Step 1

Concept

In the sum, \(x^2+2x^2=3x^2\), (-3x+x=-2x), and (2-5=-3). Add like terms separately.

Step 2

Why this answer is correct

The correct answer is A. \(3x^2-2x-3\). In the sum, \(x^2+2x^2=3x^2\), (-3x+x=-2x), and (2-5=-3). Add like terms separately.

Step 3

Exam Tip

योग में \(x^2+2x^2=3x^2\), (-3x+x=-2x), और (2-5=-3) है। समान पदों को अलग-अलग जोड़ें।

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

किस विकल्प में \(3x^2-2x+7\) में से \(x^2+4x-5\) घटाने का सही परिणाम है?

Which option gives the correct result of subtracting \(x^2+4x-5\) from \(3x^2-2x+7\)?

Explanation opens after your attempt
Correct Answer

A. \(2x^2-6x+12\)

Step 1

Concept

(\(3x^2-2x+7\)-\(x^2+4x-5\)=2x-2-6x+12). Change all signs of the second expression while subtracting.

Step 2

Why this answer is correct

The correct answer is A. \(2x^2-6x+12\). (\(3x^2-2x+7\)-\(x^2+4x-5\)=2x-2-6x+12). Change all signs of the second expression while subtracting.

Step 3

Exam Tip

(\(3x^2-2x+7\)-\(x^2+4x-5\)=2x-2-6x+12)। घटाते समय दूसरे व्यंजक के सभी चिह्न बदलें।

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