Question

Fungsi f ditentukan dengan f(x) = x² - 5x. nilai f(4) - f(-2) =? (jawab dengan penjelasan)

Answer 1

Jika fungsi f(x) =   - 5x
f(4) =  - 5x4
f(4) = 16-20
f(4) = -4

f(-2) =  - 5(-2)
f(-2) = 4 + 10
f(-2) = 14
 Maka F(4) - f(-2) = -4 - 14 = -18

Answer 2

F(x)= x^2 - 5x

f(4) = 4^2 - 5(kali)4 = 16 - 20 = -4
f(-2) = (-2)^2 - 5(kali)-2 = 4 +10 = 14

f(4)-f(-2) = -4 - 14 = -18