- #1

- 145

- 0

## Homework Statement

Determine[tex] f^{-1}(0)[/tex] of [tex] f(x) = ln (4-7x) + ln(-7-5x)[/tex]

## Homework Equations

[tex]f(x) = ln (4-7x) + ln(-7-5x)[/tex]

## The Attempt at a Solution

What I did was

[tex]y = ln (4-7x)(-7-5x)[/tex]

Then I swapped x and y to attempt to make the inverse function

[tex]x = ln (4-7y)(-7-5y)[/tex]

and I start to solve for y

[tex]e^{x} = 35y^2 + 29y -28[/tex]

But this is where I am stuck. What do I do now? :/