No Logarithm of a Negative NumberDate: 8/6/96 at 21:22:36 From: Anonymous Subject: Logarithm of Negative Number Hello, Please tell me how to solve this problem: log(-5) = ? Date: 8/6/96 at 21:47:11 From: Doctor Robert Subject: Re: Logarithm of Negative Number Since a logarithm is an exponent, your question is equivalent to the question "What power of 10 gives me -5?" Positive exponents of 10 do not give negative results, and neither do negative exponents. The answer is that you cannot find the logarithm of a negative number (at least, not over the set of real numbers). I hope that this helps. -Doctor Robert, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
Search the Dr. Math Library: |
[Privacy Policy] [Terms of Use]
Ask Dr. Math^{TM}
© 1994-2013 The Math Forum
http://mathforum.org/dr.math/