a. Use limits to find the derivative function f' for the following function f. b. Evaluate f'(a) for the given values of a. X f(x) = a = - 9, 0 X+6 7The limit below is a definition of f'(a). Determine the function f(x) and the value of a. (5 + h) - 5 lim h h-0 (5 + h) - 5 The value of the constant a in the limit lim is a = h h-0In the graph to the right, the straight line y = - x + b is tangent y to the graph of f(x) =