Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2012 | Oct-Nov | (P1-9709/13) | Q#1

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Question

Find the coefficient of  in the expansion of .

Solution

First rewrite the given expression in standard form.

Expression for the general term in the Binomial expansion of  is:

In the given case:

Hence;

Since we are looking for the term of   : we can  equate 

Subsequently substituting  in:

Since we are interested in the coefficient of ;

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