2025 IGCSE 0580 February/March P42 Q14

2025 IGCSE 0580 February/March P42 Q14

5 marks

\(\mathrm{f}(x)=5-4x\)

  1. Find \(\mathrm{f}(-3)\).[1]
  2. Find \(\mathrm{f}(3-2x)\).
    Give your answer in its simplest form.[2]
  3. Find \(\mathrm{f}^{-1}(x)\).[2]

Solution:

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Answer:(a) \(17\). (b) \(8x-7\). (c) \(\mathrm{f}^{-1}(x)=\dfrac{5-x}{4}\).

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