Derivative : solution for exercise 4.11 - Basic math level
In mathematics, the logarithm of a number to a given base is the power or exponent to which the base must be raised in order to produce the number. For example, the logarithm of 81 to the base 3 is 4, because 4 is the number of 3s that must be multiplied together to get 81: thus 3 × 3 × 3 × 3 = 81. In the language of exponents: 34 = 81, so log3(81) = 4.
