Use the product (a + b) (a – b) = a^2 – b^2 to evaluate : 4.6 5.4 - Vidyadip

Question

Use the product $(a + b) (a – b) = a^2 – b^2$ to evaluate : $4.6 \times 5.4$

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Answer

$4.6 \times 5.4 $
$= (5−0.4) (5+0.4)$
$= (5)^2− (0.4)^2$
$= 25 − 0.16$
$= 24.84$

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