Which of the following functions is not one-one? - Vidyadip

MCQ

Which of the following functions is not one-one?

A
$\frac{3-x}{3+x}$
B
$\sqrt{x}$
✓
$x^2+1$
D
None of these.

✓

Answer

Correct option: C.

$x^2+1$

(c) : Since $f(x)=f(-x)=x^2+1$ for all $x \in R$, therefore, $f$ is not one-one.

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