be able to come back to the skipped part Tutorial Exercise Find the limit if it exists lim f x where f x X 6 x 3x 4 if x 6 x 3x 40 if x 6 Step 1 Find the value of the function as x 6 That is the limit from the left Thus lim f x lim X 6 X 6 X means that x approaches 6 from values less than 6