f(y) = x + (-4)

f(x) = x² + 4

f(x) = 1*6

f(x) = 5x²

غير ذلك

f(y) = x-4 /3

f(x) = x-4 /3

f(x) = - 5 /3 x - 8

f(x) = 5 /3 x - 6

x² + x - 6

- x² - 5x + 4

x² + 5x - 4

28

10

22