anonymous
  • anonymous
Find the second derivative of the function. f(x) = (ln(x))^9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
9(lnx)^8 / x is the first derivative. Then you'll have to use quotient rule for the second derivative. derivative of the top multiplied by bottom term, minus derivative of the bottom multiplied by the top term, all divided by the bottom squared.
anonymous
  • anonymous
i am still a little confused on how to do that
anonymous
  • anonymous
I dont know wat i am suppose to do

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anonymous
  • anonymous
Do you understand the first derivative? The second derivative is then derivative of the top (72(lnx)^7) multiplied by the bottom (x). 72x(lnx)^7 Then subtract the derivative of the bottom multiplied by the top from this term. 1(9(lnx)^8) Now you have 72x(lnx)^7-(9(lnx)^8) Now divide all of this by the bottom squared (x^2) final is just 72x(lnx)^7-(9(lnx)^8) / x^2 You can check wolfram alpha (a site) and it will show you the steps too if i did it wrong
anonymous
  • anonymous
I understand the first derivative. It is just when we have to find the second or third that i get confused at wat to do. thnxs for all ur help
anonymous
  • anonymous
i tried this answer and it is not accepting it. idk y it is doing that
anonymous
  • anonymous
I probably didn't do it right then lol, http://www.wolframalpha.com/input/?i=second+derivative+%28lnx%29%5E9 If you want the right answer here you go. (click show steps)
anonymous
  • anonymous
thnxs sooo much. This website will b a big help in the future!
anonymous
  • anonymous
You have no idea :P

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