Jika f(x) = 4x-1, maka f-¹ (7) =...

f(x) = 4x-1
y = 4x - 1
4x = y + 1
x = y/4 + 1/4
Jadi 
f⁻¹(x) = x/4 + 1/4

f⁻¹(7) = 7/4 + 1/4
f⁻¹(x) = 8/4
f⁻¹(x) = 2

misalkan f(x)= y
maka :
y = 4x-1
y+1 = 4x
(y+1)/4 = x
(x+1)/4 = f ^{-1}(x)

f ^{-1}(7) = ((7)+1)/4 = 2