Răspuns:
Explicație pas cu pas:
calculezi det(M)=[tex]8m^{3} +1+1-2m-2m=8m^{3} -6m+2[/tex]
det(M)=0, [tex]4m^{3} -3m+1=0, 4m^{3}-4m+m+1=0, 4m(m^{2} -1)+m+1=0,\\4m(m-1)(m+1)+m+1=0\\(m+1)(4m(m-1)+1)=0\\m+1=0, m=-1,\\4m^{2}-4m+1=0, (2m-1)^{2}=0, m=\frac{1}{2}[/tex]
