Results 1 to 2 of 2

Math Help - negative logs

  1. #1
    Member
    Joined
    Sep 2009
    Posts
    104
    Thanks
    1

    negative logs

    "Explain why it is not possible to use the product law of logarithms to evaluate the expression log(-7) + log(-4)?"

    I had a TIPS/Comm assignment yesterday, and i had this question. I didn't know how to answer it, except that you can't evaluate xlog(y) with y < 0 .. how would you guys do it?
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member bigwave's Avatar
    Joined
    Nov 2009
    From
    honolulu
    Posts
    580
    well this isn't a formal proof but...
    <br />
y = log_{a}(x)\ means \  x = a^y

    so if a is taken to a postive or negatve exponent x will always be positive

    example

    2^3 = 8\ \     2^{-3} = .1250
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. problem in negative negative exponential distribution
    Posted in the Advanced Statistics Forum
    Replies: 2
    Last Post: July 4th 2011, 08:29 AM
  2. Replies: 9
    Last Post: February 22nd 2011, 05:39 PM
  3. Replies: 2
    Last Post: March 26th 2009, 05:30 PM
  4. Replies: 5
    Last Post: March 26th 2009, 03:36 PM
  5. negative fractions to negative exponents
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 24th 2006, 06:02 PM

Search Tags


/mathhelpforum @mathhelpforum