$$\( \mathrm{f}(x)=3 x+2 \quad \mathrm{~g}(x)=x^{2}+1 \quad \mathrm{~h}(x)=4^{x}\)$$ Find $$\(x\)$$ when $$\(\mathrm{h}^{-1}(x)=2\)$$. $$\[ x= ............................................ \]$$
Exam No：0580_s20_qp_42 Year：2020 Question No：6(g)
Answer:
16
Knowledge points:
E1.3 Calculate with squares, square roots, cubes and cube roots and other powers and roots of numbers.
E2.9.1 Use function notation, e.g. f(x)=3x-5, f:x↦3x-5, to describe simple functions.
E2.9.2 Find inverse functions
E2.9.3 Form composite functions as defined by gf(x)=g(f(x)).
Solution:
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