I need help please with finding the x-intercept for the following:

$\displaystyle y = -2x^2 +4$

I got the y-intercept (0,4) by setting x = 0

However, when I set y = 0 and attempt to solve I get stuck

$\displaystyle 0 = -2x^2 + 4$

What are the next steps for finding the x-intercept? Thanks in advance!