Results 1 to 4 of 4

Math Help - finding differential

  1. #1
    Junior Member
    Joined
    Oct 2009
    Posts
    72

    finding differential

    Find the differential of each function.
    y = (1+r^4)^-2

    I used the power + chain rule and got

    -8r^3/(1+r^4)^3

    what am i doing wrong?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    No one in Particular VonNemo19's Avatar
    Joined
    Apr 2009
    From
    Detroit, MI
    Posts
    1,823
    Quote Originally Posted by break View Post
    Find the differential of each function.
    y = (1+r^4)^-2

    I used the power + chain rule and got

    -8r^3/(1+r^4)^3

    what am i doing wrong?
    Nothing, except forgetting the notation.

    With diffferentials

    dy=f'(x)dx

    So, tag on a dx and you're all set.

    Unless, of course, by 'differential', you actually meant to say 'derivative'. If this is thecase, maybe you're looking at the wrong answer manual.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Oct 2009
    Posts
    72
    ohh yeah it was the "dr" i was forgetting. i feel so dumb thanks haha.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    No one in Particular VonNemo19's Avatar
    Joined
    Apr 2009
    From
    Detroit, MI
    Posts
    1,823
    Quote Originally Posted by break View Post
    ohh yeah it was the "dr" i was forgetting. i feel so dumb thanks haha.
    Hmmm...

    Are you sure, because now I'm wondeering whether or not r\text{ varies with t}, perhaps?

    Are you doing a related rates problem or something?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Finding a differential.
    Posted in the Calculus Forum
    Replies: 3
    Last Post: July 13th 2011, 12:10 PM
  2. Finding the differential of dy
    Posted in the Calculus Forum
    Replies: 5
    Last Post: July 20th 2010, 11:55 PM
  3. finding a differential eq.
    Posted in the Differential Equations Forum
    Replies: 0
    Last Post: March 7th 2010, 01:21 AM
  4. Finding the Differential
    Posted in the Calculus Forum
    Replies: 3
    Last Post: July 27th 2009, 09:57 AM
  5. Finding this differential
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 22nd 2008, 09:19 AM

Search Tags


/mathhelpforum @mathhelpforum