Question

factorise : a² b² - a²- b² + 1

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Answer 1

Answer:

a^2b^2 - a^2 - b^2 + 1

a^2(b^2 -1) - 1 (b^2-1)

(a^2-1)(b^2-1)

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