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Linearization problem help

  1. Feb 25, 2008 #1
    1. The problem statement, all variables and given/known data
    find the linearization of L(x) at a.
    f(x)=ln7x, a=1/7

    2. Relevant equations

    3. The attempt at a solution

    i got f(1/7)=0 and f'(1/7)=9.12
    then shouldn't it be 0+.9.12(x-0)=9.12x?
    Last edited by a moderator: Mar 7, 2013
  2. jcsd
  3. Feb 25, 2008 #2
    Not quite - Check your derivative again - if it helps, remember, ln(ax) = ln(a) + ln(x).
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