\(\Leftrightarrow\left|1-x\right|+4x^2+4x+1=4x^2-x+5\)
\(\Leftrightarrow\left|1-x\right|=4-5x\)
- Nếu \(x\le1\Rightarrow1-x=4-5x\Rightarrow x=\frac{3}{4}\) (t/m)
- Nếu \(x>1\Rightarrow x-1=4-5x\Leftrightarrow x=\frac{1}{2}\) (loại)
Vậy \(x=\frac{3}{4}\)