\(49m^2-70mn+25n^2\) का गुणनखंडन कौन सा है?
Which is the factorisation of \(49m^2-70mn+25n^2\)?
Explanation opens after your attempt
A. ((7m-5n)2)
Concept
(49m-2=(7m)2) and (25n-2=(5n)2). The middle term is \(-2\cdot7m\cdot5n\).
Why this answer is correct
The correct answer is A. ((7m-5n)2). (49m-2=(7m)2) and (25n-2=(5n)2). The middle term is \(-2\cdot7m\cdot5n\).
Exam Tip
(49m-2=(7m)2) और (25n-2=(5n)2) है। मध्य पद \(-2\cdot7m\cdot5n\) है।
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