Question

x^2-4x+2>0

Answer 1

the question is asking for what values of x, is the curve positive...

so I'd suggest you investigate the discriminant

or graph the parabola

\[\Delta = b^2 - 4ac\]

if the discriminant < 0 and a > 0 then the parabola the parabola is concave up and is positive definite

if the discriminant < 0 and a < 0 the parabola is concave down and negative definite

use this website if you want to graph the curve

https://web.geogebra.org/app/#