Determine all of the critical numbers of the given function.
I'm like 90% sure that means solve for x, check if what you got for x actually works, and that/those are your critical number(s).
Anyways, here's the problem:
Any ideas anyone? I tried solving for x:
then squared both sides
then moved some stuff around
and now I'm stuck there, not even knowing if I'm supposed to be doing this.