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3.2 Algebra and Functions (A-level only)

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Question 14

The function f f\,f is defined by

f(x)=3+ln⁡(5x−4),x∈R,x>0.8 f(x) = 3 + \ln(5x - 4), \quad x \in \mathbb{R}, x > 0.8 f(x)=3+ln(5x−4),x∈R,x>0.8
a.

Find the exact value of ff(1)ff(1)ff(1)

[2]
b.

Find an expression for f−1(x)f^{-1}(x)f−1(x)

[3]

3.2 Algebra and Functions (A-level only) Questions

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