Evalute: (405)^2-(395)^2 - Vidyadip

Question

Evalute: $ \left\{(405)^2-(395)^2\right\} $

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Answer

$ \left\{(405)^2-(395)^2\right\} $
$ (405)^2-(395)^2 $
$ =(405+395)(405-395) $
$ \left\{\because a^2-b^2(a+b)(a-b)\right\} $
$ =800 \times 10=8000 $

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