Given H(x)=√1+x^2 find functions f(x) and g(x) such that (fog)(x) =H(x)

Question

Given H(x)=√1+x^2 find functions f(x) and g(x) such that (fog)(x) =H(x)

Super confused

Answer 1

h(x) = sqr(1+x^2) = f(g(x))

what is f(x) and g(x)??

g(x) = 1+x^2

f(x) = sqr(x)