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m^{4}-3m^{2}-30m+72
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m^{4}-3m^{2}-30m+72
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m^{4}-3m^{2}-20m+36-10m+36
Use the distributive property to multiply m^{2}-4m+4 by m^{2}+4m+9 and combine like terms.
m^{4}-3m^{2}-30m+36+36
Combine -20m and -10m to get -30m.
m^{4}-3m^{2}-30m+72
Add 36 and 36 to get 72.
m^{4}-3m^{2}-20m+36-10m+36
Use the distributive property to multiply m^{2}-4m+4 by m^{2}+4m+9 and combine like terms.
m^{4}-3m^{2}-30m+36+36
Combine -20m and -10m to get -30m.
m^{4}-3m^{2}-30m+72
Add 36 and 36 to get 72.
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