Question

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)​

Answer 1

Answer:

the answer for this question is

the answer for this question is ab - a - b + 1 = (a - 1)(b - 1)

Answer 2

Answer:

ab-a-b+1=(1-a)(b-1)