Question

LAST QUESTION GUYS PLEASE LORD HELP ME

Answer 1

D. 13

Step-by-step explanation

The given function is:

`f(x) = (2x + 1)/(x -4)`

Let

`y = (2x + 1)/(x -4)`

Interchange x and y.

`x= (2y + 1)/(y-4)`

Solve for y.

`x(y - 4)=2y + 1`

`xy - 4x=2y + 1`

`xy - 2y = 1 + 4x`

`(x - 2)y = 1 + 4x`

`y = (1 + 4x)/(x - 2)`

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

We put x=3,

`{f}^( - 1)(3) = (1 + 4 * 3)/(3- 2)`

`{f}^( - 1)(3) = (13)/(1) = 13`