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Homework Help: Equation of Tangent Line

  1. Mar 16, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the equation of the tangent line on the function, f(x) = X[tex]^{2}[/tex]-4x+1, which is perpendicular to the line, x+2y=10.

    2. Relevant equations

    3. The attempt at a solution

    x+2y=10
    2y = 10-x
    y=-1/2x+5
    Slope of perpendicular is -1/2, so slope of tangent is 2.
    The derivative of f(x):
    f'(x)= 2x-4.
    f'(x) represents the slope of the tangent = 2
    Where can I go from here?
    Thank you.
     
  2. jcsd
  3. Mar 16, 2009 #2
    I figured out my answer. :)
    I don't need a reply, but I don't know how to delete the thread.
     
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