\(x^2-9\) का गुणनखंडन किस पहचान से होगा?
Which identity is used to factorise \(x^2-9\)?
Explanation opens after your attempt
C. (a-2-b-2=(a-b)(a+b))
Concept
\(x^2-9=x^2-3^2\), so the difference of squares identity is used. Exam tip: identify both terms as squares.
Why this answer is correct
The correct answer is C. (a-2-b-2=(a-b)(a+b)). \(x^2-9=x^2-3^2\), so the difference of squares identity is used. Exam tip: identify both terms as squares.
Exam Tip
\(x^2-9=x^2-3^2\) है इसलिए वर्गों के अंतर की पहचान लगेगी। परीक्षा में दोनों पदों को वर्ग के रूप में पहचानें।
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