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S2 Mathematics

Question post on Fri, 19/05/2017 1:23pm

Please factorise the expression completely: (1-a²) (1-b²) + 4ab

I can’t solve this… Pls help and thank you.

jieheng · Answer 1 · Post on Fri, 19/05/2017 7:40pm

(1 – a²)(1 – b²) + 4ab

= 1 – a² – b² + a²b² + 4ab

= 1 + 2ab + a²b² – (a² – 2ab + b²)

= (1 + ab)² – (a – b)²

=(1 + ab + a – b) (1 + ab – a + b)

SAHMom · Answer 2 · Post on Fri, 19/05/2017 7:44pm

SAHMom Post on Fri, 19/05/2017 7:44pm

Thank you!