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Within the real numbers, logarithms of zero and negative numbers are not defined. If you are interested in calculating logarithms within the complex number system, the Wikipedia article on "logarithm" has the necessary formulae. In this case, you can obtain the logarithm of a negative number, but not of zero.

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14y ago

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Using a calculator, log of 123 = 4.81218

This means 10^(4.81218) = 123 (approximately)

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12y ago
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Q: What is the log of -123?
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