Simplify -10*(13i-9)

$- 10 \cdot (13 i - 9)$

Apply the distributive property.

$- 10 (13 i) - 10 \cdot - 9$

Simplify the expression.

Multiply $13$ by $- 10$ .

$- 130 i - 10 \cdot - 9$

Multiply $- 10$ by $- 9$ .

$- 130 i + 90$

Reorder $- 130 i$ and $90$ .

$90 - 130 i$

$90 - 130 i$

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