tolong jawab pertanyaan nomor 4 dan 5 beserta jalannya, please y kk.

F(x) = 3x - 8
Y = f(×)
Y = 3x - 8
3x = y + 8
X. =( y + 8 )/3
F(×) invers = (x + 8)/3

F(4)invers + f(2) invers
(4 + 8)/3 + (2 + 8)/3
12/3 + 10/3
22/3
Thanks