the expansion of (5x+y-32)^2 is
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(5x + y - 32) ^2
(5x +y - 32) (5x + y +32) = {(5x + y) - 32}
By using formula (a)^2 - (b) ^2 =(a+b) (a-b)
= (5x + y) ^2- (32)^2
=(5x)^2 + (y) ^2 + 2x 5x x y - 5x5
=25x^2 + y^2 + 10 xy - 25
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