Somebody want to help with this derivative:(adsbygoogle = window.adsbygoogle || []).push({});

y = (7.75x^{3}+ 2250) / 750x

I differentiate it with the quotient rule and get:

dy/dx = 31x / 1500 - 3 / x^{2}

But that's wrong. It's got a zero around 5 - 6 and the original function has its minimum at (4.03, 1.12). Not sure what I did wrong.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Differentiating This Function

**Physics Forums | Science Articles, Homework Help, Discussion**