(a)[4]
Expand $(2 - 3x)^{-2}$ in increasing powers of $x$, stopping at and including the term in $x^2$, and simplify the coefficients.
(b)[1]
Give the set of $x$ values for which the expansion is valid.
Mathematics 9709 · AS & A Level · Algebra
Algebra — practice question
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Give a correct unsimplified form of the $x$ term or the $x^2$ term from the expansion of $(2-3x)^{-2}$ or $(1-\tfrac{3}{2}x)^{-2}$” …
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