CBSE Class 9 Answered
Prove
that (x+y)3 - (x - y)3 - 6y (x2 - y2) = 8y3.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
(x+y)3 -(x-y)3-6y(x2 - y2)
i.e.,
where a =x+y
b = x-y
But 
= (a-b)3
Therefore, (a-b)3 = {x+y-(x-y)}3
=
Answered by | 04 Jun, 2014, 03:23: PM
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