Question

if a = 3 + b prove a Cube - b cube - 9ab=27

Answer 1

you can see your answer

Answer 2

Hi...dear...here is your answer...
......
Given,
a = 3 + b
a - b = 3...................(1).

on making cube of both sides....we get,
(a-b)³ = 3³
a³ - b³- 3ab*(a-b) = 27
a³ - b³- 3ab×3 = 27..... .......form equation (1)
a³ - b³- 9ab = 27......
hence proved!!!....
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