Let f : R → R be defined as f(x) = x². The function f is:

Let f : R → R be defined as f(x) = x². The function f is:

• A. one-one and onto
• B. one-one but not onto
• C. onto but not one-one
• D. neither one-one nor onto

Answer: D) neither one-one nor onto

Explanation: f(1) = 1 = f(−1) so not one-one. Negative real numbers are not in range since x² ≥ 0, so not onto.