jika g(y) = 3y^2 - 7y, tentukan : g(y-1) + g(3y).

g(y) = 3y² - 7y

g(y-1) = 3(y-1)² - 7(y-1)
           = 3(y² - 2y + 1) - 7y + 7
           = 3y² - 6y + 3 - 7y + 7
           = 3y² - 13y + 10

g(3y) = 3(3y)² - 7(3y)
          = 3. 9y² - 21y
          = 27y² - 21y

g(y-1) + g(3y) = 3y² - 13y + 10 +  27y² - 21y
                       = 30y² - 34y + 10