Factorise : x^2 +2ax-b^2-2ab.
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x^2 +2ax - b^2 - 2ab
=> (x^2 - b^2) + 2ax - 2ab
=> (x+b) (x-b) + 2a(x-b)
=> (x-b) (x+b+2a)
=> (x^2 - b^2) + 2ax - 2ab
=> (x+b) (x-b) + 2a(x-b)
=> (x-b) (x+b+2a)
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