Question

so mais essa 4x²-16x+14 ?

Answer 1

$4x^2-16x+14=0\\ \\ 2x^2-8x+7=0\\ \\ \Delta=(-8)^2-4.2.7=64-56=8\\ \\ x=\frac{8 \pm \sqrt8}{4}=\frac{8 \pm2\sqrt2}{4}=\frac{4 \pm\sqrt2}{2}\\ \\ S=\{\frac{4\pm\sqrt2}{2}\}$