Suppose that f is a function given as f (a) = - 4x - 7x -4. Simplify the expression f(a + h). f(x + h) = f(x t h) - f(x) Simplify the difference quotient, h f(x th) - f(x) h The derivative of the function at x is the limit of the difference quotient as h approaches zero. f(x th) - f(x) f' (x) = lim E h-0 h