Differentiating natural log

  • Thread starter AwesomeSN
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  • #1
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Homework Statement



Differentiate, f(x)=71+x/1-x

Homework Equations





The Attempt at a Solution



Working this out, hoping it's right as I was going along, my final answer is 71+x/1-x * (2ln7)/1-x
 

Answers and Replies

  • #2
Check your denominator....

Looks like you may have had a bit of a problem after you applied the chain rule. A great way to check your answers is to plug them in on www.wolframalpha.com. If you are incorrect, you can always ask us about the accuracy of your steps.
 
  • #3
Ray Vickson
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Homework Statement



Differentiate, f(x)=71+x/1-x

Homework Equations





The Attempt at a Solution



Working this out, hoping it's right as I was going along, my final answer is 71+x/1-x * (2ln7)/1-x

Please learn to typeset expressions properly; in particular, USE PARENTHESES. Your function is f(x) = 7(1+x)/(1-x). What you wrote actually means 71 + (x/1) -x = 7.

RGV
 

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