(-n+3)(-8)

To distribute the -8, multiply it by each term inside the parentheses:

(-n+3)(-8) = -8*(-n) + -8*(3)

Multiplying -8*-n gives 8n:

8n + -8*(3)

Multiplying -8*3 gives -24:

8n - 24

So, (-n+3)(-8) = 8n - 24.