Question

$R$ is the set of real numbers, If $f:R\to R$ is defined by $f\left(x\right)=\sqrt{x}$ then $f$ is

• A. bijective function
• B. one one and into function
• C. many to one function
• D. not a function

Answer 1

The correct option is D not a function

Since domain of $f$ is $R$ but for $x<0$ $f\left(x\right)=\sqrt{x}$ is not defined.
Hence $f$ is not a function.