Diket f(x)=6x+5 dan g(x)=⅓(x+4) Nilai dari (gof)-¹(5) adalah... Tolong ya..

jawab

f(x)=  6x + 5
g(x) =1/3 ( x + 4)

gof(x)=  g { f(x)}
= g{6x + 5) 
=  1/3 ( 6x + 5 + 4)
= 1/3 (6x + 9)
= 2x + 3

gof (x ) = 2x + 3
gof⁻¹(2x + 3) = x
(gof)⁻¹ (5) = ... 
2x + 3= 5
2x = 2
x = 1

gof)⁻¹ (5) = 1