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Determine the constant $n$ and therefore determine the coefficient of $x^2$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
When $(3 - 2x)\left(1 + \frac{x}{2}\right)^n$ is expanded, the coefficient of $x$ is $7$.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Uses the binomial expansion to identify the term in $x$ as $\frac{nx}{2}$.” …
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