Evaluate
-\left(m-3\right)\left(m+6\right)
Expand
18-3m-m^{2}
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2m^{2}+m+12-3m^{2}-4m+6
To find the opposite of 3m^{2}+4m-6, find the opposite of each term.
-m^{2}+m+12-4m+6
Combine 2m^{2} and -3m^{2} to get -m^{2}.
-m^{2}-3m+12+6
Combine m and -4m to get -3m.
-m^{2}-3m+18
Add 12 and 6 to get 18.
2m^{2}+m+12-3m^{2}-4m+6
To find the opposite of 3m^{2}+4m-6, find the opposite of each term.
-m^{2}+m+12-4m+6
Combine 2m^{2} and -3m^{2} to get -m^{2}.
-m^{2}-3m+12+6
Combine m and -4m to get -3m.
-m^{2}-3m+18
Add 12 and 6 to get 18.
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