2. Factorise: a - b - a2 + b2.
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- Factorise a2 - b2 - a - b
- a2 - b2 - a - b = [(a - b)(a + b)] - (a + b) = (a + b)(a - b - 1).
- Therefore, factors of a2 - b2 - a - b are (a + b)(a - b - 1).
I hope it helps...
:D
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