Question

Factorise 1- 2ab - (a²-b²)

Answer 1

Answer:

1-2ab-(a²+b²)

=1-(2ab+a²+b²)

=1-(a+b)²

We know that x²-y²=(x-y)(x+y)

In the equation we got, x=1 and y=(a+b)

1²-(a+b)²=(1-a-b)(1+a+b)

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