(a)[4]
Find the coefficient of $x^2$ when $(2x - 5)\sqrt{4 - x}$ is expanded.
(b)[1]
State the set of $x$ values for which the expansion in part (a) 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: “State the unsimplified $x$ term, or its coefficient, in the expansion of $(4-x)^{\tfrac12}$” …
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