1.

Factorise : 8a3 – b3 – 12a2b + 6ab2

Answer»

8a3 – b3 – 12a2b + 6ab2 

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

= (2a – b)3



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