The derivative of a function of f at a is given by f (z) = lim f(ath)- f(x) h-0 h provided the limit exists. Use the definition of the derivative to find the derivative of f (ac ) = 2x2 + 3x + 7. Enter the fully simplified expression for f (a + h) - f (a). Do not factor. f ( x t h) - f(z) = f (a) = 4x + 3