# Very simples question re: indices and differentiation

• July 3rd 2012, 12:38 PM
SamanthaJane
Very simples question re: indices and differentiation
I struggle a bit with indices, and am trying to differentiate this - I won't post the whole question, just the little bit I am stuck with. I will actually use a different fraction as well, as I need to know how to do it myself! It is just the theory I am struggling with.

x^9/2

I differentiate this to 9/2x^7/2

Is that correct?

I feel I need to do some shuffling around of the result, to tidy it up a bit and make it easier to work with, but am getting mixed up with square roots and fractions etc.

Thanks.
• July 3rd 2012, 01:22 PM
Plato
Re: Very simples question re: indices and differentiation
Quote:

Originally Posted by SamanthaJane
I struggle a bit with indices, and am trying to differentiate this - I won't post the whole question, just the little bit I am stuck with. I will actually use a different fraction as well, as I need to know how to do it myself! It is just the theory I am struggling with.
x^9/2
I differentiate this to 9/2x^7/2
Is that correct?

It is always best to post the whole question,
$\frac{{d\left( {{x^{9/2}}} \right)}}{{dx}} = \left( {\frac{9}{2}{x^{7/2}}} \right)$