A complex number is a number in the form $\displaystyle{a}+{b}{i}\usepackage{cmbright}\Huge\$ where a and b are real numbers. The term $\displaystyle{b}{i}\usepackage{cmbright}\Huge\$ is referred to as the imaginary part. Because $\displaystyle{3}+{i}\sqrt{{3}}={3}+\sqrt{{3}}{i}\usepackage{cmbright}\Huge\$ , $\displaystyle\sqrt{{{3}}}{i}\usepackage{cmbright}\Huge\$ is the imaginary part. This is the same as $\displaystyle{i}\sqrt{{3}}\usepackage{cmbright}\Huge\$ .