Math Help - Demand function

1. Demand function

Question is in the link. I was thinking that the way to get rid of the e is to take the ln of both sides, but can you even take then ln of 0?
Help is much appreciated!

http://img42.imageshack.us/img42/4577/22729885.jpg (just zoom it in, and my cursor is beside the x, its supposed to be (b) x =500 units).

Thanks,

Auger

2. Originally Posted by Auger
Question is in the link. I was thinking that the way to get rid of the e is to take the ln of both sides, but can you even take then ln of 0? why get rid of the e ?
Help is much appreciated!

http://img42.imageshack.us/img42/4577/22729885.jpg (just zoom it in, and my cursor is beside the x, its supposed to be (b) x =500 units).

Thanks,

Auger

just substitute in the given x-values and evaluate p