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Find the value of the non-zero constant $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Within the expansion of $(2 + ax)^7$, the coefficients of $x$ and $x^2$ are equal.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Expansion used, giving $7C1\,x^2\times a(x)$ and $7C2\,x^2\times [a(x)]^2$” …
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