\(a^2-2ab+b^2-9\) का गुणनखंडन कौन सा है?
Which is the factorisation of \(a^2-2ab+b^2-9\)?
Explanation opens after your attempt
A. ((a-b-3)(a-b+3))
Concept
First write (a-2-2ab+b-2=(a-b)2). Then subtract \(9=3^2\) to make difference of squares.
Why this answer is correct
The correct answer is A. ((a-b-3)(a-b+3)). First write (a-2-2ab+b-2=(a-b)2). Then subtract \(9=3^2\) to make difference of squares.
Exam Tip
पहले (a-2-2ab+b-2=(a-b)2) लिखें। फिर \(9=3^2\) घटाकर वर्गों का अंतर बनाएं।
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