Posted by Daisy on Tuesday, January 22, 2008 at 2:18am.
I would advice to take out the 1/x^2 term first:
(3x - (2/x^2))^8 =
1/x^16 (3 x^3 - 2)^8 =
So you need to get x^18 from the expansion of the bracket:
(3 x^3 - 2)^8 contains a term:
(3 x^3)^6 (-2)^2 Binomial(8,6)
So, the coefficient is 81648.
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