m^3-4m^2+16m+192=0

问题描述:

m^3-4m^2+16m+192=0

m^3-4m^2+16m+192=0
(m^3+4m^2)-(8m^2-16m-192)=0
m^2(m+4)-8(m^2-2m-24)=0
m^2(m+4)-8(m-6)(m+4)=0
(m+4)(m^2-8m+48)=0
(m+4)[(m-4)^2+32]=0
m=-4