factories a^2+2ab+b^2-16
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Answer:
a2 + 2ab + b2 - 16
(a + b )2 - (4) 2
assuming (a+b) as x and 4 as y ..and by using the identity (x+y)(x-y) = x2 - y2
[ (a+b) + 4 ] * [ (a+b) - 4 ]
so ( a+b+4)(a+b-4)
Hope that helps........!!!