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For the expansion of $(\frac{1}{ax} + 2ax^2)^5$, the coefficient of $x$ is $5$. Determine the value of the constant $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Identify or infer the term $5\times \binom{2}{?}(\frac{1}{ax})^3(2ax^2)^2$” …
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