This is just asking you to find all x in the domain taht get mapped into the interval [4,25]
So and also (all you do is take the positive and negative square root of the closed set interval)
This is a textbook problem...
f(x) = x^2
(ii)Find f^-1([4, 25])
The first one is easy but how do I do the 2nd one? I've never encountered something like this.