Question

How do you solve `4ln(-x)+3=21` and find any extraneous solutions?

Answer 1

I found: `x=-90.0171`

Explanation:

We can rearrange our expression:
`4ln(-x)=21-3`
`4ln(-x)=18`
`ln(-x)=18/4=4.5`
We use the definition of (natural) log to get:
`-x=e^(4.5)`
And:
`x=-90.0171`