4. which of the following is the correct factorisation of ab - a - b + 1 ?*
(1 Point)
ab-a-b + 1 = (1 - a)(1 + b)
ab - a - b + 1 = (a - 1)(b - 1)
ab - a - b + 1 = (1 - a)(b-1)
ab - a - b + 1 = (a - 1)(1 - b)
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the answer for this question is
the answer for this question is ab - a - b + 1 = (a - 1)(b - 1)
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2
Answer:
ab-a-b+1=(1-a)(b-1)
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