$$$ \operatorname{Let} \mathrm{f}(x)=\frac{15-6 x}{(1+2 x)(4-x)} $$$. Express $$$\mathrm{f}(x)$$$ in partial fractions. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics

IGCSE&ALevel

CAIE

Exam No：9709_s21_qp_33 Year：2021 Question No：4(a)

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State or imply the form $\frac{A}{1+2 x}+\frac{B}{4-x}$ and use a correct method to find a constant
Obtain one of $A=4$ and $B=-1$
Obtain the second value

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