Ex 2.4, 10 (ii) - Chapter 2 Class 9 Polynomials

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Ex 2.4, 10 Factorise each of the following: (ii) 64m3 – 343n3 64m3 – 343n3 = (4m)3 – (7n)3 From Ex 2.4,9 we know x3 – y3 = (x - y) (x2 + xy + y2) where x = 4m , y = 7n = (4m – 7n) [ (4m)2 + (7n)2 + (4m) (7n)] = (4m – 7n) [ 16m2 + 49n2 + 28mn]

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