Evaluate
-4m\left(m+4\right)
Expand
-4m^{2}-16m
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16-4\left(m^{2}+4m+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+2\right)^{2}.
16-4m^{2}-16m-16
Use the distributive property to multiply -4 by m^{2}+4m+4.
-4m^{2}-16m
Subtract 16 from 16 to get 0.
16-4\left(m^{2}+4m+4\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(m+2\right)^{2}.
16-4m^{2}-16m-16
Use the distributive property to multiply -4 by m^{2}+4m+4.
-4m^{2}-16m
Subtract 16 from 16 to get 0.
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