Nilai f(4) – f(-2) adalah….
(A) -18 (C) -10
(B) -16 (D) 2
12. Fungsi f ditentukan dengan f(x) = x2 – 5x.
Penjelasan dengan langkah-langkah:
f(x) = x² – 5x
f(4) = 4² – 5(4)
f(4) = 16 – 20
f(4) = -4
f(-2) = (-2)² – 5(-2)
f(-2) = 4 – (-10)
f(-2) = 4 + 10
f(-2) = 14
Maka, Nilai f(4) – f(-2)
= -4 – 14
= -18 (Opsi A)