Question

Help please..untuk besok

1. f(x) =6x-3, g(x) = 5x+4 , (fog)(a) = 81, a=......

2. f(x) = x-1/2x-1, f-1(2x-1)=....

3. f(x) = akar x+1, (fog)(x) = 2akar x+1, g(x) =......


Ini tentang fungsi komposisi dan invers btw

Answer 1

............................................

Answer 2

1.) (fog)x = f(gx)
>6(5x+4)-3=81
>30x+21=81
>30a+21=81
>30a=81-21
>30a=60, a=2

2.) f(x)=x-1/2x-1
     f(x)^-1=x-1/2x-1
     f(2x-1)=(2x-1)-1/2(2x-1)-1
               =2x-1/4x-3

nomer 3 nya nggak nemu hehe, maaf klo salah