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a) (a+b)²=a²+b²+2ab
(x+7)(x+7)=(x+7)²=x²+7²+2(x)(7)=x²+49+14x
b) (x+a)(x+b)=x²+(a+b)x+ab
(3x+1)(3x-8)=(3x)²+(1-8)3x+1×-8=9x²-21x-8
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ur...answer is above....
hope it'll help u...
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