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Expand $\frac{1 + 3x}{\sqrt{1 + 2x}}$ in ascending powers of $x$ up to and including the term in $x^2$, and simplify the coefficients.
Mathematics 9709 · AS & A Level · Algebra
Algebra — practice question
Worked solution & mark scheme
This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Obtain $1-x$ as the initial two terms of $(1+2x)^{-\frac12}$” …
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