Diketahui (fog)(x)= -x3+2x+1 dan f-1(x)= 4-x, maka nilai (gof)(-3) sama dengan....

f-¹(x) = 4 - x
x = 4 - y
y = 4 - x
f(x) = 4 - x

(f ○ g)(x) = f(g(x))
-x³ + 2x + 1 = 4 - g(x)
g(x) = x³ - 2x + 4 - 1
g(x) = x³ - 2x + 3

f(-3)
= 4 - (-3)
= 7

(g ○ f)(-3)
= g(f(-3))
= 7³ - 2(7) + 3
= 343 - 14 + 3
= 332