The properties of logarithms are listed below with a separate example for each one with numbers instead of variables. X Research source These only work if the base a and the argument are positive. The properties of logarithms allow you to solve logarithmic and exponential equations that would be otherwise impossible. Know and apply the properties of logarithms. Logs that have the 64 th base are used in Advanced Computer Geometry ( ACG) domain. Binary logs have a base of 2 (for the example, log 2x).
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Other Logs: Other logs have the base other than that of the common log and the E mathematical base constant.For the time being however, it's important to become familiar with the basics of natural logarithms. Natural logs are critical for the advance study of math and science and you will learn more about their uses in future courses. Note than you can find the natural log of 20 on your calculator using the LN button. For example, ln 20 means the natural log of 20 and since the base of a natural log is e, or 2.71828, the value of the natural log of 20 is approximately equal to 3 because 2.71828 to the 3rd is approximately equal to 20. In other words, it's an irrational number that we round to 2.71828. You can think of it like the value of pi where there is an infinite number of digits after the decimal place. It's important to understand that 2.71828 or e is not an exact value. The larger the value we plug in for n, the closer we get to 2.71828. e is a mathematical constant that is equal to the limit of (1 + 1/n) n as n approaches infinity, which is approximately equal to 2.718281828.
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Natural logs: These are logs with a base of e.If a log is written without a base (as log x), then it is assumed to have a base of 10. Know the difference between a common log and a natural log.