m^4+7m^3+12m^2=0

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First you have to factor m out as many times as you can-m^2(m^2+7m+12)=0Then you can factor the equation in the parenthesis above-m^2(m+3)(m+4)Finally you can set each factor to 0 and solve-m^2=0m=0m+4=0m=-4m+3=0m=-3hope this helps!!!