4024/11 May/Jun 2023, Question 20: Inverse Functions
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Given f(x) = 10 + 7x, find the inverse function f⁻¹(x).
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Solution · 2 marks
- 1y = 10 + 7x
- 27x = y − 10
- 3x = (y − 10)/7
- 4f⁻¹(x) = (x − 10)/7
Answer(x − 10)/7
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