Question

Factorise :-64m3 343n3

Answer 1

64m3343n3=(4m)3(7n)3

       =(4m -7n)[(4m)2+(4m)(7n)+(7n)2]          [ a3 - b3 = (a - b)(a2 + b2 + ab)]

       =(4m -7n)(16m2+28mn+49n)2