Evaluate (m-3+4n)*(-8)

$(m - 3 + 4 n) \cdot (- 8)$

Apply the distributive property.

$m \cdot - 8 - 3 \cdot - 8 + 4 n \cdot - 8$

Simplify.

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Move $- 8$ to the left of $m$ .

$- 8 \cdot m - 3 \cdot - 8 + 4 n \cdot - 8$

Multiply $- 3$ by $- 8$ .

$- 8 \cdot m + 24 + 4 n \cdot - 8$

Multiply $- 8$ by $4$ .

$- 8 \cdot m + 24 - 32 n$

$- 8 m + 24 - 32 n$