Question

xao quadrado - 4x + 1=0

Answer 1

$x^{2} -4x+1 \\ \Delta=(-4)^2-4.1.1 = 16-4=12 \\ {x_1=\frac{4-\sqrt{12}}{2}=\frac{4-2\sqrt3}{2}=2-\sqrt3 \\ \\ x_2=\frac{4+\sqrt{12}}{2}=\frac{4+2\sqrt3}{2}=2+\sqrt3$