Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2010 | May-Jun | (P1-9709/11) | Q#2
i. Find the first 3 terms in the expansion of in descending powers of .
ii. Hence find the coefficient of 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 value of in the expansion of
First we know from (i) that
Therefore coefficient of variable :