diketahui f (x) = 2x+5 dan g (x)= 4-x, tentukan f-1 0 g-1

f(x) = 2x + 5
Y = 2x + 5
2x = y - 5
x = (y - 5) / 2
f-¹(x) = (x -5) / 2

g(x) = 4 - x
y = 4 - x
x = 4 - y
g-¹(x) = 4 - X

f-¹ o g-¹
= ( (4 - x) - 5) / 2
= (4 - x - 5) / 2
= (-x - 1) / 2
Atau
= (x + 1) / -2