Given $f\left(x\right)=x^2$, compute $f\left(3\right)$ and explain which point you would plot for $x=3$ on the Cartesian plane.

$f\left(3\right)=6$

Plot $(3,6)$

$f\left(3\right)=9$

Plot $(3,9)$

$f\left(3\right)=9$

Plot $(9,3)$

$f\left(3\right)=1$

Plot $(3,1)$