Functions $$\(\mathrm{f}\)$$ and $$\(\mathrm{g}\)$$ are defined for $$\(x \in \mathbb{R}\)$$ by $$\[ \begin{aligned} &\mathrm{f}: x \mapsto \frac{1}{2} x-a, \\ &\mathrm{~g}: x \mapsto 3 x+b, \end{aligned} \]$$ where $$\(a\)$$ and $$\(b\)$$ are constants. Given that $$\(\mathrm{gg}(2)=10\)$$ and $$\(\mathrm{f}^{-1}(2)=14\)$$, find the values of $$\(a\)$$ and $$\(b\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................

Mathematics
IGCSE&ALevel
CAIE
Exam No:9709_s20_qp_11 Year:2020 Question No:6(a)

Answer:

\[
3(3 x+b)+b=9 x+4 b \rightarrow 10=18+4 b
\]

\[
b=-2
\]

Either \(\mathrm{f}(14)=2\) or \(\mathrm{f}^{-1}(x)=2(x+a)\) etc.
\[
a=5
\]

Knowledge points:

1.2.1 understand the terms function, domain, range, one-one function, inverse function and composition of functions

Solution:

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