Consider f : R+→ [4, ∞) given by f (x) = x2 + 4. Show that f is invertible with the inverse f –1 of f given by f –1(y) = y − 4 , where R+ is the set of all non-negative real numbers.

Consider f : R+→ [4, ∞) given by f (x) = x2 + 4. Show that f is invertible with the inverse f –1 of f given by f –1(y) = y − 4 , where R+ is the set of all non-negative real numbers.