diketahui g(x)=3x^2-1 dan (fog)(x) 2x^2-4 maka f (1) sama dengan

g(x) = 3x² - 1

(fog)(x) = 2x² - 4
f(1) = f(g(x))

g(x) = 1
3x² - 1 = 1
3x² = 1 + 1
x² = 2/3

f(1) = f(g(x)) = 2. 2/3 - 4
f(1) = 4/3 - 12/3
f(1) = -8/3