Easy MCQ +4 / -1

A function f: ℝ → ℝ is defined by f(x) = x². It is:

  1. A One-one and onto
  2. B One-one but not onto
  3. C Onto but not one-one
  4. D Neither one-one nor onto Correct answer

Solution

f(x) = x²: not one-one (f(2)=f(-2)=4); not onto (no x gives -4). Range = [0, ∞) ⊂ ℝ.

About this question

Subject: Mathematics · Chapter: Sets, Relations and Functions · Topic: Types of Functions

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