Yes. Whenever you have an equation of the form , then y is ALWAYS given by .

This is because x^2 = (-x)^2, and hence if you were to do the inverse, you wouldn't know whether x or -x was the original term, so we include both as solutions!

This isn't just the rule, but in fact, it is the rule for any EVEN exponent.

So if you had , then your answer would always be .