a2-(b-2)a-2b
factorise
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a + 2b)2 – a2 = ( a + 2b)2 – (a)2. = (a + 2b + a) (a + 2b – a). = (2a + 2b) (2b). = 2 (a + b) (2b). = 2 × 2b (a + b). = 4b (a + b) ...
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