Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2018 | May-Jun | (P1-9709/11) | Q#1
i. Find the first three terms in the expansion, in ascending powers of , of .
ii. Given that the coefficient of in the expansion of is 12, find the value of the constant a.
Expression for the Binomial expansion of is:
First rewrite the given expression in standard form.
In the given case:
To find the term with in the expansion of
From (i) we have;
We are interested only in coefficient of which is equal to 12.,