Hey! How do you find the derivative of the following using the first derivative principles?

a) f(x)=7/x-x

b) f(x)=(x+1)^1/2

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- Jan 20th 2009, 02:57 PMSculthorpCalc Derivative Question
Hey! How do you find the derivative of the following using the first derivative principles?

a) f(x)=7/x-x

b) f(x)=(x+1)^1/2 - Jan 20th 2009, 02:59 PMJhevon
- Jan 20th 2009, 03:04 PMSculthorp
Thanks for the help! The problem is with the 7/x-x I get 7/0 which is not possible right? So.... is this not possible to get the derivative?

- Jan 20th 2009, 03:23 PMskeeter
I don't think the function is $\displaystyle \frac{7}{x-x}$ ... most probably it's $\displaystyle \frac{7}{x} - x$