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Find the value of $a$, given that it is a non-zero constant.
Mathematics 9709 · AS & A Level · Series
Series — practice question
Within the expansion of $(2 + ax)^6$, the coefficient of $x^2$ is the same as the coefficient of $x^3$.
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Combines combinations and indices correctly to reach $15 \text{ or } \binom{16}{2} \times 2^4 \times (ax)^2$, or a matching equivalent expression.” …
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