Question

The complete solution set of the inequality $x^2+4x+6>0$ is

Answer 1

$x^2+4x+6>0$

$\frac{-b\pm \sqrt{b^2-4ac}}{2a}>0$

$\frac{-4\pm \sqrt{16-24}}{2}>0$

$\frac{-4\pm \sqrt{-8}}{2}>0$

$\frac{-4\pm 2\sqrt{2}}{2}>0$

$-2\pm i\sqrt{2}>0$