# Math Help - I want check my answer in derivatives (part 1)

1. ## I want check my answer in derivatives (part 1)

I want check my answer in derivatives (part 1)

2. Originally Posted by r-soy
I want check my answer in derivatives (part 1)
Is this Jeopardy? (what's the question?)

3. find the first and second derivatives

4. Originally Posted by wonderboy1953
Is this Jeopardy? (what's the question?)

FAO OP: It is easier on us if you can use LaTeX or even plain text, if used correctly. I noticed with another post that your image host does not seem too reliable or quick.

NB: on your notation it looks like you're doing $\bar{y}$ which means something completely different.

In question 1 where has your denominator gone?

Question 2 - check your signs when using negative exponents. $\dfrac{d}{dz} -z^{-n} = nz^{-n-1}$ (either that or I cannot make out the + sign)

Question 3 - Yep

edit: you can also use wolfram to find out the answers to derivatives type in derive f(x) where f(x) is your function