Cari dengan cara cepat turunan f (x) =18(1/2x³ - 1/4x² - 1/6x+3)...

f (x) = 18/2x³ - 18/4x² - 18/6x + 3
f '(x) = 3.18/2x² - 2.18/4x - 18/6
        = 3.9x² - 18/2x - 3
        = 27x² - 9x -3