how to find the difference quotient of f?
['Plug x + h into the function f and simplify to find f(x + h).', 'Now that you have f(x + h), find f(x + h) - f(x) by plugging in f(x + h) and f(x) and simplifying.', 'Plug your result from step 2 in for the numerator in the difference quotient and simplify.']