1. ## Differentiate Question

Hi
The question i have is how to find the derivative of the following: 6+ z / z^3 , z not equal to 0.

I have gone through using chain rule and product rule but still cannot get the correct answer.

The answer is -18 - 2z / z^4.

P.S

2. Originally Posted by Paymemoney
Hi
The question i have is how to find the derivative of the following: 6+ z / z^3 , z not equal to 0.

I have gone through using chain rule and product rule but still cannot get the correct answer.

The answer is -18 - 2z / z^4.

P.S
Do you mean (6+ z)/ z^3, that is, $\frac{6 + z}{z^3}$?

Then note: $\frac{6 + z}{z^3} = \frac{6}{z^3} + \frac{z}{z^3} = \frac{6}{z^3} + \frac{1}{z^2} = 6 z^{-3} + z^{-2}$.

The quotient rule can also be used.

3. thanks i've got it now