5.factorize the following. (iv) (a + b) 2 - (a - b) 2
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(a+b)^2-(a -b)^2
=[a+b+a-b][a+b-(a-b)]
=(2a)(a+b-a+b)
=2a*2b
=4ab
=[a+b+a-b][a+b-(a-b)]
=(2a)(a+b-a+b)
=2a*2b
=4ab
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