Mathematics 9709 · AS & A Level · Series

Series — practice question

(i)[2]

Find the first 3 terms of $(1 - 2x^2)^8$, arranged in ascending powers of $x$.

(ii)[2]

Find the coefficient of $x^4$ when expanding $(2 - x^2)(1 - 2x^2)^8$.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A correct expansion gives $1 - 16x^2 + 112x^4$” …