(a+b)^2 -11(a+b)-42 solve question
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(a+b)^2 -11(a+b)-42
= (a+b)×{a+b - 11(a+b)}+42
= (a+b)×{9(a+b)}+42
= 9(a+b)^2+42
= (a+b)×{a+b - 11(a+b)}+42
= (a+b)×{9(a+b)}+42
= 9(a+b)^2+42
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