Past Papers’ Solutions | Cambridge International Examinations (CIE) | AS & A level | Mathematics 9709 | Pure Mathematics 1 (P1-9709/01) | Year 2015 | Oct-Nov | (P1-9709/13) | Q#2
Find the coefficient of x in the expansion of .
We are given expression as;
Expression for the general term in the Binomial expansion of is:
In the given case:
Since we are looking for the terms with i.e. : we can equate;
Now we can find the term with; Substituting ;
Hence the coefficient of the term containing is 7.