I'm going to use the foil method.
First
Outside
Inner
Last
So let's multiply the first term in each factor:
\(m*m=m^2\)
Then the outer terms:
\(m*3=3m\)
Then we'll multiply the inner terms:
\(-6*m=-6m\)
And finally, the last terms:
\(-6*3=-18\)
Now add everything that we got together:
\(m^{2}+3m-6m-18\)
And simplify:
\(m^{2}-3m-18\)
And that's your final answer!
