Find the value of p and q that make the function continuous

[egc]

Homework Statement

Find the value of p and q that make the function continuous

Homework Equations

f(x)= x-2 if x≥2
$\sqrt{p-x^{2}}$ -2<x<2
q-x if x≤-2

The Attempt at a Solution

lim f(x)= x-2
n→2+

lim f(x)=q-x
n→-2

I really have no idea how to continue,the teacher never explained this and I have a test tomorrow please help!

 

[egc]

Does q= -2 and p=4 ?