Answer: Neither one-one nor onto.
- A One-one but not onto
- B Onto but not one-one
- C Bijective
- D Neither one-one nor onto
Correct answer: D. Neither one-one nor onto
Explanation: f(2) = f(−2) breaks injectivity, and no negative number is attained so it is not onto ℝ.
Concept context
Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions