invers fungsi f(x)=2×-1

f(x) = 2x - 1
misal 2x - 1 = y
2x = y + 1
x = y + 1 / 2

f-1(y) = y + 1 / 2
f-1(x) = x + 1 / 2

Langsung aja y

fof`¹(x) = x

f{f`¹(x)} = x

2f`¹(x) - 1 = x

f`¹(x) = x+1 / 2

Semoga berguna +_+