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Line 1: − A '''logarithm''' of a [[number]] is the [[exponential]] power to which you raise the base to obtain the number.+ +
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[[Image:log.png|thumb|right|px=200|Logarithm with various bases]]
'''Logarithm''' of a [[number]] is the [[exponential]] power to which you raise the base to obtain the number.
For high school [[algebra]], the most common logarithms are base-10 (the common log) and base ''[[e]]'' (the [[natural logarithm|natural log]]).
For high school [[algebra]], the most common logarithms are base-10 (the common log) and base ''[[e]]'' (the [[natural logarithm|natural log]]).