Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2003 | May-Jun | (P1-9709/01) | Q#1
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Question
Find the value of 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 value of the coefficient of , i.e.
we can equate
Finally substituting in:
Therefore the coefficient of is
.
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