Factorise a-2b 2-a2
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Step-by-step explanation:
(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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