Question

11. Factorise : 1 - 2ab – (a2 + b2).​

Answer 1

Step-by-step explanation:

Given expression can be written as, 1-2ab-a²-b²

= 1-(a+b)²

= 1²-(a+b)²

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

Ans.(a+b+1)(a+b-1)

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