Ta có \(x^3-6x^2+12-8=0\)
\(\Rightarrow x^3-6x^2+4=0\)
\(\Rightarrow x^3-6x^2=-4\)
\(\Rightarrow x^2.\left(x-6\right)=-4\)
đề bài sai sai thì phải :v
x3 - 6x2 + 12 - 8
<=> (x + 2)3 = 0
<=> x + 2 = 0
<=> x = 0 - 2
<=> x = -2
=> x = -2
x3 - 6x2 + 12 - 8
(x + 2)3= 0
x + 2 = 0
x = 0 - 2
x = -2
x = -2