Question

If g(x) = 3x-4 , find g -1(5)​

Answer 1

First let g(x) = y

g⁻¹(y) = x

y = 3x - 4

y + 4 = 3x

(y + 4)/3 = x

(y + 4)/3 = g⁻¹(y)

At y = 5

g⁻¹(5) = (5+4)/3 = 3

g⁻¹(5) = 3