$$\[ \mathrm{f}(x)=x^{2}+1 \quad \mathrm{~g}(x)=1-2 x \quad \mathrm{~h}(x)=\frac{1}{x}, x \neq 0 \quad \mathrm{j}(x)=5^{x} \]$$ Find the value of $$\(\mathrm{f}(3)\)$$ .............................................
Exam No：0580_w20_qp_42 Year：2020 Question No：10(a)(i)
Answer:
10
Knowledge points:
E2.9.1 Use function notation, e.g. f(x)=3x-5, f:x↦3x-5, to describe simple functions.
E2.9.3 Form composite functions as defined by gf(x)=g(f(x)).
Solution:
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