Suppose that f is a function given as f(x) Simplify the expression f(x + h). f(x + h) = Simplify the difference quotient, f(x +h)-f(x) h - x-3x - 2. - f'(x) = lim h0 f(x +h)-f(x) h The derivative of the function at a is the limit of the difference quotient as h approaches zero. f(x+h)-f(x) h