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(a+b) square - (a-b) square =4ab how does it happen |
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Answer» (a+b)^2-(a-b)^2=a^2+b^2+2ab-(a^2+b^2-2ab)=a^2+b^2+2ab-a^2-b^2+2ab=4ab (a+b)2^-(a+b)^2=a^2+b^2+2ab-(a^2+b^2-2ab)=a^2+b^2+2ab-a^2-b^2+2ab=2ab+2ab=4abHence proved Open bracket s of LHS using identity |
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