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3.2 Algebra and Functions (A-level only)

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Question 58

The functions f f\,f and g g\,g are defined by

f:x→ln⁡(3x−2),x∈R,x>23 f: x \rightarrow \ln(3x - 2), \quad x \in \mathbb{R}, x > \frac{2}{3} f:x→ln(3x−2),x∈R,x>32​ g:x→3x−2,x∈R,x≠2 g: x \rightarrow \frac{3}{x-2}, \quad x \in \mathbb{R}, x \neq 2 g:x→x−23​,x∈R,x=2
a.

Find the exact value of fg(3)fg(3)fg(3)

[2]
b.

Find an expression for f−1(x)f^{-1}(x)f−1(x) and state its domain

[4]
c.

Sketch the graphs of f(x)f(x)f(x) and f−1(x)f^{-1}(x)f−1(x) on the same diagram

[3]
d.

Sketch the graph of y=∣g(x)∣y = |g(x)|y=∣g(x)∣

[3]
e.

Find the exact values of ∣3x−2∣=4\displaystyle | \frac{3}{x-2} | = 4∣x−23​∣=4

[3]

3.2 Algebra and Functions (A-level only) Questions

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