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Determine the possible values of the constant $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
When $(3 + ax)^5 + (6 - x)^4$ is expanded, the coefficient of $x^2$ is six times the coefficient of $x$.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The coefficient of $x^2$ is identified correctly, e.g. $270a^2+216$” …
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