How do you simplify -3i*5i-3(-7+6i)?

Sep 20, 2016

$36 - 18 i$

Explanation:

Multiply the 2 leading values, distribute the bracket and collect like terms.

$\Rightarrow - 15 {i}^{2} + 21 - 18 i$

$\textcolor{\mathmr{and} a n \ge}{\text{Reminder }} \textcolor{red}{\overline{\underline{| \textcolor{w h i t e}{\frac{a}{a}} \textcolor{b l a c k}{{i}^{2} = {\left(\sqrt{- 1}\right)}^{2} = - 1} \textcolor{w h i t e}{\frac{a}{a}} |}}}$

$\Rightarrow - 15 {i}^{2} + 21 - 18 i = 15 + 21 - 18 i = 36 - 18 i$