Results 1 to 4 of 4

Math Help - Slopes of Tangents and Secants 2

  1. #1
    Junior Member
    Joined
    Jan 2009
    Posts
    43

    Slopes of Tangents and Secants 2

    Sorry I'm pretty sure it said post a new thread for a different question....well here it is:

    lim f(a + h) - f(a) / h
    h->0

    Use that forumla to find the slope of the tangent line of the cubic funciotn y = x^3 at the point (1,1)

    This formula keeps messing me up.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    is up to his old tricks again! Jhevon's Avatar
    Joined
    Feb 2007
    From
    New York, USA
    Posts
    11,663
    Thanks
    3
    Quote Originally Posted by Dickson View Post
    Sorry I'm pretty sure it said post a new thread for a different question....well here it is:

    lim f(a + h) - f(a) / h
    h->0

    Use that forumla to find the slope of the tangent line of the cubic funciotn y = x^3 at the point (1,1)

    This formula keeps messing me up.
    you want f'(1) = \lim_{h \to 0} \frac {f(1 + h) - f(1)}h

    where f(x) = x^3

    now, what about this formula is messing you up?

    what is f(1), f(1 + h)?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,894
    Thanks
    691
    f(x) = x^3

    a = 1

    f(1+h) = (1+h)^3 = 1 + 3h + 3h^2 + h^3

    f(1) = 1

    now find the limit of the difference quotient.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Junior Member
    Joined
    Jan 2009
    Posts
    43
    Yeah see I used sum of cubes for the top
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Can someone help me with secants and tangents?
    Posted in the Pre-Calculus Forum
    Replies: 6
    Last Post: April 18th 2011, 05:52 AM
  2. Function, secants and tangents
    Posted in the Calculus Forum
    Replies: 1
    Last Post: October 14th 2009, 07:14 PM
  3. Slopes of Secants
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: May 21st 2009, 10:47 AM
  4. Secants and Tangents
    Posted in the Geometry Forum
    Replies: 2
    Last Post: May 16th 2009, 09:27 PM
  5. [SOLVED] Slopes of Tangents and Secants
    Posted in the Calculus Forum
    Replies: 5
    Last Post: February 12th 2009, 04:34 PM

Search Tags


/mathhelpforum @mathhelpforum