1.

Factorise a3 – 3a2b + 3ab2 – b3

Answer»

a3 – 3a2b + 3ab2 – b3 

= (a)3 – 3 (a)2 (b) + 3 (a) (b)2 – (b)3 

= (a – b)3 

= (a – b) (a – b) (a – b)



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