Evaluate (399)square
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(500-111)^2
(a-b)^2=a^2-2ab+b^2
=(500)^2-2(500)(111)+(111)^2
=2,50,000-1,11,000+12321
=1,39,000+12321
=1,51,321
(a-b)^2=a^2-2ab+b^2
=(500)^2-2(500)(111)+(111)^2
=2,50,000-1,11,000+12321
=1,39,000+12321
=1,51,321
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