jika f^-1(x)=3x+5 dan (gof)^-1=x-1,invers fungsi g adalah

jawab
fungsi invers

(gof)⁻¹ = x - 1
 f⁻¹ o g⁻¹ (x) =  x - 1
f⁻¹ { g⁻¹(x)} = x - 1
3. g⁻¹ (x) + 5 = x - 1 
3. g⁻¹(x) = x - 1 - 5 = x - 6
g⁻¹(x)= 1/3 ( x - 6)