Solve: a^2+2 a b+b^2-16 - Vidyadip

Question

Solve:
$ a^2+2 a b+b^2-16 $

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Answer

$ a^2+2 a b+b^2-16 $
$ =a^2+2 \times a \times b+b^2-16 $
$ =(a+b)^2-4^2 $
$ =(a+b-4)(a+b+4) $

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