Use the product (a + b) (a – b) = a^2 – b^2 to evaluate : 103 97 - Vidyadip

Question

Use the product $(a + b) (a – b) = a^2 – b^2$ to evaluate : $103 \times 97$

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Answer

$103 \times 97 $
$= (100+3) (100−3)$
$= (100)^2 − (3)^2$
$= 10000 − 9$
$= 9991$

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