# `f(x) = (x^(2/3))/(1 + x + x^4)` Use a computer algebra system to graph `f` and to find `f'`

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Expert Answers

tiburtius | Certified Educator

We will find the derivative using Wolfram Mathematica (you can also use Wolfram Alpha which is free). For graphing we will use GeoGebra (freeware) because Mathematica cannot graph powers with fractional exponents for negative numbers.

**Graph of **

*f(x)=x^(2 / 3) / (1 + x + x^4)*

By writing the above line of code we obtain the graph of shown in the image below.

**Finding **

*Simplify[D[x^(2/3)/(1 + x + x^4), x]]*

In the code line above command *Simplify* is there to simplify the result obtained by differentiation.

The result is `f'(x)=(2 - x - 10 x^4)/(3 x^(1/3) (1 + x + x^4)^2)`

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