Using the formula (a+b)^2= (a^2+2 a b+b^2 ), evaluate: (630)^2 - Vidyadip

Question

Using the formula $(a+b)^2=\left(a^2+2 a b+b^2\right)$, evaluate:
$(630)^2$

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Answer

$(630)^2$
$=(600+30)^2$
$=(600)^2+2 \times 600 \times 30+(30)^2$
$=(360000+36000+900)$
$=396900$

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