Consider the function f(x) = 4x2 + 5x - 3 on the closed interval [ - 1, 1]. Find the exact value of the slope of the secant line connecting ( - 1, f( - 1) ) and (1, f(1)). m By the Mean Value Theorem, there exists c in ( - 1, 1) so that m = f'(c). Find all values of such c in ( - 1, 1). Enter exact values. If there is more than one solution, separate them by a comma. C =