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August 2, 2015

Homework Help: same type of binomial theorem question

Posted by nicholas on Tuesday, August 4, 2009 at 9:01am.

Question:

Find the first 3 terms in the expansion, in ascending powers of x, of
(2 + x)^6. Hence, obtain the coefficient of x^2 in the expansion of
(2 + x - x^2)^6

I know the first part of the question, and the first 3 terms are
(64 + 192x + 240x^2 + ...)
How do i use this answer in the second part??

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