why????????????(a+b)^2=a^2+b^2+2ab
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Answer:
please check this attachment. this is the proof !
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ANSWER
(a+b)²= a²+2ab+b²
Why?
Now, squaring of a number/variable means multiplying it with itself.
Now,
(a+b)²= (a+b)(a+b)
=a(a+b)+b(a+b)
= a²+ab+ab+b²
=a²+b²+2ab
when we apply this identity we only skip the above calculation thats why it is called a identity/formula in order to save time.
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