-3m(m+8)

The first step is to distribute the -3m to both terms inside the parentheses:

-3m(m+8) = -3m^2 - 24m

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To simplify the expression -3m(m+8), we can apply the distributive property and then combine like terms.

Step 1: Distribute the -3m to both terms inside the parentheses:
-3m * m = -3m^2
-3m * 8 = -24m

Step 2: Combine the two terms we obtained:
-3m^2 - 24m

So, the simplified expression for -3m(m+8) is -3m^2 - 24m.