Re: differentiation of fractional and negative powers

ChrisD90
Messages
1
Reaction score
0
Hi !
Im having a problem with a question!

I need to differentiate the equation 1/ root of (3x^2 + 2) !
Using the formula (f(x+delta) - f(x)) / delta !
Your help would be appreciated!
 
Physics news on Phys.org
Thanks for posting in the correct forum :smile:

Yes, those square-root problems are tricky at first.

We do need to see an attempt (by you) at solving the problem before we offer help. Your textbook probably has an example worked out, involving a square-root function. Look at that, see what you can come up with, and then post here again.

FYI, some info on posting HW questions:
https://www.physicsforums.com/showthread.php?t=94383
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
Back
Top