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Logarithm Question

 
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gothic5



Joined: 09 Jun 2014
Posts: 20

Posted: Thu Mar 02, 2017 12:13 am    Post subject: Logarithm Question Reply with quote

Does anyone know how to find the log of a negative number using a calculator?-Any Mathematical formulas I found online were too complex for me and I found nothing after a search for any videos explaining how to do this. Harold
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skyrack



Joined: 02 Aug 2012
Posts: 184
Location: Thailand

Posted: Thu Mar 02, 2017 9:13 am    Post subject: Reply with quote

The natural logarithm function ln(x) is defined only for x>0. So the natural logarithm of a negative number is undefined. The complex logarithmic function Log(z) is defined for negative numbers too.
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gothic5



Joined: 09 Jun 2014
Posts: 20

Posted: Fri Mar 03, 2017 12:19 am    Post subject: Reply with quote

Skyrack-Could I calculate the log for -4 by using certain keys on calculator?
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SteveGus



Joined: 19 Sep 2011
Posts: 47
Location: Southern Indiana

Posted: Fri Mar 03, 2017 6:06 pm    Post subject: Reply with quote

Logarithms are the opposite of exponents. For instance, the base 10 logarithm of 1000 is 3, because 10^3 = 1000. This means that there aren't really logarithms of negative numbers, because the exponential roots of negative numbers are all imaginary (i = SQR(-1)). Bear in mind also that x^-n = 1/x^n, which also suggests that n must be positive to avoid imaginary solutions.
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