# Math Help - Wondering if I did this right..

1. ## 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)??

2. 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.