Using the formula (a-b)^2= (a^2-2 a b+b^2 ), evaluate: (891)^2 - Vidyadip

Question

Using the formula $(a-b)^2=\left(a^2-2 a b+b^2\right)$, evaluate:
$(891)^2$

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Answer

$(891)^2$
$=(900-9)^2$
$=(900)^2-2 \times 900 \times 9+(9)^2$
$=810000-16200+81$
$=793881$

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