\(x^2-81\) का गुणनखंडन क्या होगा?
What will be the factorisation of \(x^2-81\)?
Explanation opens after your attempt
A. ((x-9)(x+9))
Concept
\(81=9^2\) and \(x^2-81\) is a difference of squares. So ((x-9)(x+9)) is obtained.
Why this answer is correct
The correct answer is A. ((x-9)(x+9)). \(81=9^2\) and \(x^2-81\) is a difference of squares. So ((x-9)(x+9)) is obtained.
Exam Tip
\(81=9^2\) है और \(x^2-81\) वर्गों का अंतर है। इसलिए ((x-9)(x+9)) मिलेगा।
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