1.

Factorise each of the following : (i) 27y3 + 125z3 (ii) 64m3 – 343n3

Answer»

(i) 27y3 + 125z3 

= (3y)3 + (5z)3 

= (3y + 5z) {(3y)2 – (3y)(5z) + (5z)2

= (3y + 5z) (9y2 – 15yz + 25z2

(ii) 64m3 – 343n3 = (4m)3 – (7n)3 

= (4m – 7n) {(4m)2 + (4m) (7n) + (7n)2

= (4m – 7n) (17m2 + 28mn + 49n2)



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