Question

show that : (9im-3n)^2 - (9im+3n)^2 = -108imn

Answer 1

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Answer 2

(a-b) ^2 - (a+b) ^2 =-4ab
(9im-3n)^2 - (9im+3n)^2 =4(9im)(3n)=- (108imn)