Hey there!
I'm assuming your expression is actually [tex] \frac{2x - 15}{x + 9} [/tex]. If it's not, let me know and I'll be happy to help you out further.
If x were equal to –9, your expression would be undefined. If you solve it with this value plugged in for x, you will get the following:
[tex] \frac{2x - 15}{x + 9} [/tex]
[tex] \frac{2(-9) - 15}{(-9) + 9} [/tex]
[tex] \frac{-18 - 15}{0} [/tex]
[tex] \frac{-33}{0} [/tex]
[tex]error[/tex]
You can't divide anything by zero. This expression would be undefined if x were –9 since it makes the denominator zero. Therefore, x ≠ –9.
Hope this helped you out! :-)
