Question

factorise (a-b)2 - (c-d)2​

Answer 1

ab (c2 + d2) – a2cd – b2cd

= abc2 + abd2 – a2cd – b2cd

= abc2 – a2cd – b2cd + abd2

= ac (bc – ad) – bd (bc – ad)

= (bc – ad) (ac – bd)

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