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