Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2010 | May-Jun | (P1-9709/13) | Q#2
i. Find the first 3 terms, in descending powers of , in the expansion of .
ii. Find the coefficient of in in the expansion of .
First rewrite the given expression in standard form.
Expression for the Binomial expansion of is:
In the given case:
To find the coefficient of in the expansion of
First we know from (i) that
Since we are interested in the coefficient of variable :