MCQ
Which of the following functions is not one-one?
- A$\frac{3-x}{3+x}$
- B$\sqrt{x}$
- ✓$x^2+1$
- DNone 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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