factorise x^2+2ax-b^2-2ab
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x²+2ax-b²-2ab
x²-b²+2ax-2ab
(x+b)(x-b)+2a(x-b)
(x-b) {(x+b) +2a}
(x-b)(x+b+2a)
x²-b²+2ax-2ab
(x+b)(x-b)+2a(x-b)
(x-b) {(x+b) +2a}
(x-b)(x+b+2a)
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