Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2019 | May-Jun | (P1-9709/12) | Q#1
Find the coefficient of x in the expansion of .
We are required to find the coefficient of in the expansion of given expression.
We are given expression as;
Expression for the general term in the Binomial expansion of is:
First rewrite the given expression in standard form.
In the given case:
Since we are looking for the coefficient of : we can equate;
Now we can find the coefficient of; Substituting ;
Hence the coefficient of is .