Evaluate using the expansion of (a + b)^2 or (a – b)^2 :(415)^2 - Vidyadip

Question

Evaluate using the expansion of $(a + b)^2$ or $(a – b)^2 :(415)^2$

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Answer

$(415)^2 = (400 + 15)^2= (400)^2+ (15)^2+ 2(400)(15)$
$= 160000 + 225 + 12000$
$= 172225$

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