Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2019 | May-Jun | (P1-9709/13) | Q#2
i. In the binomial expansion of , the first three terms are . Find the remaining three terms of the expansion.
ii. Hence find the coefficient of in the expansion of .
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 0.