Question

Let f(x)= square root x
a) find f inverse x. What is the Domain of f inverse?
b) in each case determine whether the given point lies on the graph of f of f inverse (How do I do that?).
a) 4,2
b) 2,4
c) 5, sqrt 5
d) sqrt 5, 5
e) a, f(a), where a is greater than or equal to 0
f) f(a), a
g) b, f inverse (b)
h) f inverse (b), b