ĐKXĐ : ....
PT đã cho tương đương với :
\(\left(x^2-x+2\right)-\left(2x+1\right)\sqrt{x^2-x+2}+x^2+x=0\) ( 1 )
đặt \(\sqrt{x^2-x+2}=t\left(t\ge0\right)\)
\(\left(1\right)\)trở thành : \(t^2-\left(2x+1\right)t+x^2+x=0\)
\(\Delta=\left(2x+1\right)^2-4\left(x^2+x\right)=1>0\)
\(\Rightarrow t_1=\frac{2x+1-1}{2}=x\Rightarrow\sqrt{x^2-x+2}=x\Rightarrow x=2\)
\(t_2=\frac{2x+1+1}{2}=x+1\Rightarrow\sqrt{x^2-x+2}=x+1\Rightarrow x^2-x+2=x^2+2x+1\Rightarrow x=\frac{1}{3}\)
Vậy ...