This quadratic polynomial is unable to be factored, so we'll need to use the quadratic formula:
[tex]x=\frac{-b\pm \sqrt{(b^{2})-4ac}}{2a}[/tex]
Here a=2, b=4, c=1 so:
[tex]x=\frac{-4\pm \sqrt{(4^{2})-4*2*1}}{2*2}[/tex]
If you need help from there, let me know.