\(x^3=3+\sqrt{17}+3-\sqrt{17}+3a.b\left(a+b\right)\) dài quá đặt a,b
a.b=-2
x^3=6-6(a+b)=6-6x
=>x^3+6x-5=6-5=1
KL: P(x)=12016 =1
<iframe width="640" height="360" src="https://www.youtube.com/embed/QWd7HLGLSzk" frameborder="0" allowfullscreen></iframe>