# How do you combine like terms in (6+ 8i ) + ( 1- 9i )?

May 18, 2018

$\left(7 - i\right)$

#### Explanation:

$\left(6 + 8 i\right) + \left(1 - 9 i\right)$

$\left(6 + 8 i + 1 - 9 i\right)$

$\left(6 + 1 + 8 i - 9 i\right)$

$\left(7 - i\right)$