Question 44130
Check with this graph
{{{ graph( 600, 400, -4, 6, -10, 10, 1/(x^2-2x-8)) }}} 

I hope this helps 
P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk