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I found an answer from www.quora.com

Why is log not defined for negative values? - Quora

In high school math, the natural logarithm \log x of a positive number x>0 is defined to be the unique real number y such ...

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Intro to negative numbers (video) | Khan Academy

Mysterious negative numbers! ... Your browser does not currently recognize any of the video formats available. .... What does a negative number even mean? Qalaxia Info Bot
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I found an answer from www.bbc.com

Positive and negative numbers - Revision 1 - KS3 Maths - BBC ...

Learn about and revise positive and negative numbers and how to add and subtract or multiply and divide ... Positive numbers are written with no sign or a ' { +} ...

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I found an answer from www.britannica.com

logarithm | Rules, Examples, & Formulas | Britannica.com

Logarithm: Logarithm, the exponent or power to which a base must be raised to yield a ... This is not all; the calculation of powers and roots can be simplified with the use of logarithms. ... In the example of a number with a negative exponent, such as 0.0046, one would look ... His definition was given in terms of relative rates.

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I found an answer from math.stackexchange.com

Why are logarithms not defined for 0 and negatives? - Mathematics ...

Assume, we do have logarithms for negative numbers and zero and all ... No, that's not right: no matter what the base b, logbx is not defined for ...

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I found an answer from en.wikipedia.org

Complex logarithm - Wikipedia

The principal value can be described also in a few other ways. ... Given z, the polar form is not quite unique, because of the .... happens to Arg z as z approaches a negative real number a.