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Find the value of $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
In the expansion of $(2 + ax)^4(5 - ax)$, the coefficient of $x^3$ is $432$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correctly expanded terms including $24a^2x^2$ and $8a^3x^3$” …
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