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Determine the value of the constant $a$.
Mathematics 9709 · AS & A Level · Series
Series — practice question
In the expansion of $(x^2 - \frac{a}{x})^7$, the coefficient of $x^5$ comes out as $-280$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Picks out the $x^5$ term from the expansion of $(x^2-\frac{a}{x})^7$” …
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