Question

a²b²-a²-b²+1 factorise​

Answer 1

Answer:

(a+1)(a-1)(b+1)(b-1)

Step-by-step explanation:

a²b²-a²-b²+1

=a²(b²-1)-1(b²-1)

=(a²-1)(b²-1)

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

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