# Wondering if I did this right..

• October 13th 2008, 08:54 PM
elpermic
Wondering if I did this right..
f(x) = 2x sqrt(x^2-1)

I got my answer as (4x^2 - 2)/sqrt(x^2 - 1).. IS it right??

Or is the answer (4x^2 - 1)/sqrt(x^2 - 1)??
• October 13th 2008, 09:58 PM
falconed
Quote:

Originally Posted by elpermic
f(x) = 2x sqrt(x^2-1)

I got my answer as (4x^2 - 2)/sqrt(x^2 - 1).. IS it right??

Or is the answer (4x^2 - 1)/sqrt(x^2 - 1)??

$(4x^2 - 2)/sqrt(x^2 - 1)$

That's the right one.