Answer: f(x) = 2x + 5.
- A f(x) = x²
- B f(x) = |x|
- C f(x) = sin x (domain R)
- D f(x) = 2x + 5
Correct answer: D. f(x) = 2x + 5
Explanation: f(x) = 2x + 5 is bijective (one-one and onto over R). Only bijective functions have inverses.
Concept context
Ordered pairs, Cartesian products, types of relations and functions, domain and range. Foundation for calculus and Class 12 algebra.