Functions $$\(\mathrm{f}\)$$ and $$\(\mathrm{g}\)$$ are defined for $$\(x \in \mathbb{R}\)$$ by $$\[ \begin{aligned} &\mathrm{f}: x \mapsto \frac{1}{2} x-a, \\ &\mathrm{~g}: x \mapsto 3 x+b, \end{aligned} \]$$ where $$\(a\)$$ and $$\(b\)$$ are constants. Given that $$\(\mathrm{gg}(2)=10\)$$ and $$\(\mathrm{f}^{-1}(2)=14\)$$, find the values of $$\(a\)$$ and $$\(b\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................
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.
\[
a=5
\]
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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