A table of values for $\displaystyle{f{{\left({x}\right)}}}=\sqrt{{{x}}}\usepackage{cmbright}\Huge\$ will have no negative values for x because the square root of a negative number is imaginary. There will also be no negative outputs, because $\displaystyle\sqrt{{x}}\usepackage{cmbright}\Huge\$ is defined to be the positive square root. The shape of the graph of a basic radical function is a half-parabola pointing to the right.