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-2m^{2}-\left(-4m^{2}+121\right)
Calculate -11 to the power of 2 and get 121.
-2m^{2}+4m^{2}-121
To find the opposite of -4m^{2}+121, find the opposite of each term.
2m^{2}-121
Combine -2m^{2} and 4m^{2} to get 2m^{2}.
-2m^{2}-\left(-4m^{2}+121\right)
Calculate -11 to the power of 2 and get 121.
-2m^{2}+4m^{2}-121
To find the opposite of -4m^{2}+121, find the opposite of each term.
2m^{2}-121
Combine -2m^{2} and 4m^{2} to get 2m^{2}.