ab^2+(a-1)b-1 plz help
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Step-by-step explanation:
ab^2+(a-1)b-1
ab^2+ab-b-1
ab^2+ab-b-1+2+ab-2-ab (adding and subtracting the same term)
ab^2+2ab+1-b-2-ab
(ab+1)^2-1(b+ab+2)
(ab+1)^2-1[b(a+1)+2)
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