This expression is not equivalent. Use the distributive property and simplify.

$\displaystyle{\left({3}-{5}{i}\right)}{\left(-{2}{i}\right)}={\left({3}\right)}{\left(-{2}{i}\right)}-{\left({5}{i}\right)}{\left(-{2}{i}\right)}=-{6}{i}+{10}{{i}}^{{2}}\usepackage{cmbright}\Huge\$

$\displaystyle=-{6}{i}+{10}{\left(-{1}\right)}=-{6}{i}+{\left(-{10}\right)}=-{10}-{6}{i}\usepackage{cmbright}\Huge\$