Question

Solve:

$2x^2+x+4=0$.

Answer 1

$2x^2+x+4=0x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

here ,$b=1,a=2,c=4$

$x=\frac{-1\pm \sqrt{1-32}}{4}=\frac{-1\pm \sqrt{-31}}{4}x=\frac{-1\pm i\sqrt{31}}{4},i=\sqrt{-1}$