(i)[2]
Give the first 4 terms of the expansion of $(a - x)^5$, arranged in ascending powers of $x$.
(ii)[4]
The coefficient of $x^3$ in the expansion of $(1 - ax)(a - x)^5$ is $-200$. Determine the possible values of the constant $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct expansion of $(a-x)^5$ with descending powers, with at least four terms shown” …
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