P-Q formula

Hello Babbeln,

Insert correct characters to make the P-Q formula.

$x = -\frac{p}{} \pm \sqrt{\Big(\frac{}{2}\Big)^2-}$

The right P-Q formula is like that:

$x = -\frac{p}{2} \pm \sqrt{\Big(\frac{p}{2}\Big)^2-q}$

What has been missed: 2, p, q.

Hope that was helpful.^^

Straight