No 15 kak mohon bantuannya

Kelas 10 Matematika
Bab Fungsi Komposisi

(fog) (x) = f(g(x))
(fog) (x) = f(3/x)
y = 3/x + 2

** dikali x **

xy = 3 + 2x
xy - 2x = 3
x (y - 2) = 3
x = 3/(y - 2)
(fog)⁻¹ (a) = 1
3/(a - 2) = 1
3 = a - 2
a = 3 + 2
a = 5