Question

ab whole square + ( a - 1 ) b-1=?

Answer 1

a^2b^2+ab-b-1
this should be ur answer if the question provided is correct.

Answer 2

Your Answer is here
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$\red {= {ab}^{2} + ab - b - 1 }\\ \\ \green {= ab(b + 1) - 1(b + 1) }\\ \\= (b + 1)(ab - 1)$