# How do you add (8+9i)+(-4+6i) in trigonometric form?

$\left(8 + 9 i\right) + \left(- 4 + 6 i\right) = 4 + 15 i$
$\left(8 + 9 i\right) + \left(- 4 + 6 i\right) = \left(8 - 4\right) + \left(9 i + 6 i\right)$
$\text{ } = 4 + 15 i$