- Part 1: Limit of a difference quotient 2 Suppose f (I) = - Evaluate the limit by using algebra to simplify the difference quotient (in first answer box) and then evaluating the limit (in the second answer box). lim f(6 + h) - f(6) : lim -2/9+3h h h +0 Part 2: Interpreting the limit of a difference quotient