How do you simplify $- 8 i - 7 i$ $-8i-7i$ ?

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Answer 1 · 2017-02-18T14:16:58

$- 8 i - 7 i = - 15 i$ $-8i-7i=color(green)(-15i)$

Here is an image of how $- 8 i$ $color(red)(-8i)$ and $- 7 i$ $color(blue)(-7i)$ would combine in the Complex plane:
enter image source here

How do you simplify -8i-7i−8i−7i-8i-7i?