Q. 6 A5.0( 2 Votes )

Expand the following cubes:

(3a – 2b)3

Answer :

Using Identity:

(x – y)3 = x3 – y3 – 3x2y + 3y2x


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


= 27a3 – 8b3 – 54a2b + 36b2a


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