How (a+b)^2= a^2+b^2+2ab ? Let us consider a plane area . In the shape of a square . The length of the square is (a+b) . Then our job is now to find the area of the square . We have a formula that is to find the area of the square is S^2 . Here S= (a+b) A/c to problem (a+b)(a+b)= a^2+b^2+ab+ab From the square . (a+b)^2 By this we can know how we got the formula .
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