The famous "Richter Scale" uses this formula: M = log 10 A + B. If you seek guidance on quadratic formula or perhaps dividing rational expressions, Algebra-help.org will be the ideal destination to visit! Logarithms are related to ‘times’ scales - for example in the Richter scale for earthquakes, an increase in 1 point on the scale corresponds to an increase of 10 times more energy released. Where A is the amplitude (in mm) measured by the Seismograph and B is a distance correction factor Don’t memorize the rules, understand them. Algebra-help.org contains useful facts on logarithms for dummies, grouping and lesson plan and other math subjects. Evaluate logarithms. Technically speaking, logs are the inverses of exponentials.. The decibel scale used for sound is another common example of a log scale. For example, 1000 … Intro to logarithms. Clearly, 2 3 = 8 so log 2 8 = 3. A logarithm tells what exponent (or power) is needed to make a certain number, so logarithms are the inverse (opposite) of exponentiation. Expressed mathematically, x is the logarithm of n to the base b if b x = n, in which case one writes x = log b n.For example, 2 3 = 8; therefore, 3 is the logarithm of 8 to base 2, or 3 = log 2 8. Up Next. Zoldak, a "successful businesswoman," began her explanation of logarithms with the eHow-mandated introduction (75 to 100 words): "Mathematicians and computer programmers use logarithmic exponents because it simplifies complex mathematical calculations. Here are some uses for Logarithms in the real world: Earthquakes. A logarithm to the base b is the power to which b must be raised to produce a given number. Practice: Relationship between exponentials & logarithms. The constant e and the natural logarithm. Evaluate logarithms. Logarithm, the exponent or power to which a base must be raised to yield a given number. Relationship between exponentials & logarithms: tables. Using Natural Logs With Any Rate “Sure,” you say, “This log stuff works for 100% growth but what about the 5% I normally get?” The following is an example of an exponential function: In the same fashion, since 10 2 = 100, then 2 = log 10 100. Just as an exponential function has three parts, a logarithm has three parts as well: a base, an argument and an answer (also called power). The magnitude of an earthquake is a Logarithmic scale. Next lesson. Logarithms are the "opposite" of exponentials, just as subtraction is the opposite of addition and division is the opposite of multiplication.Logs "undo" exponentials. Sort by: Top Voted. In general, for b > 0 and b not equal to 1, Some of the basic properties of logarithms are listed below. For example, log 2 8 is equal to the power to which 2 must be raised to in order to produce 8. 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