Answer: x − 5.
- A 5 − x
- B 1/(x + 5)
- C 5x
- D x − 5
Correct answer: D. x − 5
Explanation: Solving y = x + 5 for x gives x = y − 5, so f⁻¹(x) = x − 5.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions