\(7x^2-4x+9\) और \(-3x^2+8x-2\) का योग क्या होगा?
What is the sum of \(7x^2-4x+9\) and \(-3x^2+8x-2\)?
Explanation opens after your attempt
B. \(4x^2+4x+7\)
Concept
Adding like terms gives \(7x^2-3x^2=4x^2\), (-4x+8x=4x), and (9-2=7).
Why this answer is correct
The correct answer is B. \(4x^2+4x+7\). Adding like terms gives \(7x^2-3x^2=4x^2\), (-4x+8x=4x), and (9-2=7).
Exam Tip
समान पद जोड़ने पर \(7x^2-3x^2=4x^2\), (-4x+8x=4x), और (9-2=7)।
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