Question

4x(elevado a 2)-X+1=X+3X(elevado a 2)

Answer 1

$4x^2-x+1=x+3x^2\\ 4x^2-x+1-x+3x^2=0\\ x^2-2x+1=0\\ \Delta=(-2)^2-4.1.1=4-4=0\\ \\ \boxed{x=\frac{2}{2}=1}$