Simplify -6yi-9xi^4

$- 6 y i - 9 x i^{4}$

Rewrite $i^{4}$ as $1$ .

Rewrite $i^{4}$ as ${(i^{2})}^{2}$ .

$- 6 y i - 9 x {(i^{2})}^{2}$

Rewrite $i^{2}$ as $- 1$ .

$- 6 y i - 9 x {(- 1)}^{2}$

Raise $- 1$ to the power of $2$ .

$- 6 y i - 9 x \cdot 1$

$- 6 y i - 9 x \cdot 1$

Multiply $- 9$ by $1$ .

$- 6 y i - 9 x$

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