Let f (x) = Veg(z) - h(x), where f(x), g(x), h(x) are differentiable functions. (a) Find f'(x). Do not simplify your answer. (b) Let g(3) = 0, h(3) = -15, g'(3) = 8, h'(3) = 0. Find the tangent line to f at r = 3. Use exact values, not decimal approximations. Show all steps