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Exponential form is ax = b.

Logarithmic form is logab = x.

For example, 102 = 100 is the same as log10100 = 2.

Another example: 53 = 125 is the same as log5125 = 3.

If there is no number under the log (for example, log3), the the number is understood to be ten. For example, log8 is the same as log108.

A natural log uses the symbol ln. In this case, the number is understood to be e (which equals about 2.718). For example, ln5 is the same as loge5 (which the same as log2.7185).

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Q: How do you change exponential form to logarithmic form?
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