Mathematics 9709 · AS & A Level · Integration

Integration — practice question

Define $f(x)=\dfrac{x^2+4ax+6a^2}{(x+2a)(x+3a)}$, where $a$ is a positive constant.
(a)[5]

Express $f(x)$ in partial fractions.

(b)[4]

Hence find the exact value of $\int_{-a}^{a} f(x)\,dx$. Present your answer in the form $a(p+\ln q)$, where $p$ and $q$ are rational.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: State the form $A+\frac{B}{x+2a}+\frac{C}{x+3a}$

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