Simplify i^3*8

$i^{3} \cdot 8$

Factor out $i^{2}$ .

$i^{2} \cdot i \cdot 8$

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

$- 1 \cdot i \cdot 8$

Rewrite $- 1 i$ as $- i$ .

$- i \cdot 8$

Multiply $8$ by $- 1$ .

$- 8 i$

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