42. Use the pair of functions f and g to find the domain of the indicated function then find and simplify an expression for it.* f (x) = 2' and g(x) = Va + 6 (f + g)(x) (f - g)(x) (f g)(x) *This question is worth four points. In order to receive full credit, you must show your work or justify your answer. The domain of all three pairs is a > -6. The domain of all three pairs is -co -6; the domain for part c is -co