Results 1 to 2 of 2

Math Help - checking answer

  1. #1
    Junior Member
    Joined
    Jun 2008
    Posts
    39

    checking answer

    y= ln4x - 6

    find equasion of tangent line at x=2

    y' = 1/x find y - ln4(2) - 6 = -3.9

    p/s formula = y + 4.9 = x/2 equasion of tangent line @ x=2 is y= x/2 - 4.9
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,678
    Thanks
    611
    Hello, weezie23!

    I can't quite follow your work . . .


    y .= .ln(4x) - 6

    Find the equation of tangent line at x = 2
    When x = 2, .y .= .ln(8) - 6

    . . We have a point: .(2, ln(8) - 6)


    The derivative is: .y' .=] .1/x

    . . At x = 2, the slope is: .m =


    The equation of the tangent is: . y - [ln(8) - 6] .= .(x - 2)

    . . which simplifies to: . y .= .x + ln(8) - 7

    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Only checking my answer
    Posted in the Algebra Forum
    Replies: 1
    Last Post: August 20th 2009, 04:08 PM
  2. Checking an answer
    Posted in the Differential Equations Forum
    Replies: 3
    Last Post: July 19th 2009, 09:22 PM
  3. checking answer
    Posted in the Advanced Statistics Forum
    Replies: 1
    Last Post: November 3rd 2008, 12:58 PM
  4. just checking an answer
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 12th 2008, 08:37 PM
  5. checking answer
    Posted in the Calculus Forum
    Replies: 1
    Last Post: July 28th 2008, 10:34 AM

Search Tags


/mathhelpforum @mathhelpforum