Question

$f:Z\to Z$ and $f(x)=x^2$ then $f$ is

• A. bijection
• B. injection
• C. surijection
• D. not bijection

Answer 1

Answer: (D)

$f(-1)=f(1)=1\Rightarrow$ tis not one-one
$x^2>0\forall x\in R\Rightarrow R$ ange of $\ne$ codomain