how to use logarithm

Nowadays there are more complicated formulas, but they still use a logarithmic scale. Answer. You can solve equations with more than one log. Use the power property of logarithms to simplify the logarithm on the left side of the equation. In this type of log equation, the variable you need to solve for is inside the log, but the equation has more than one log and a constant. In the example above, we use the power property and the product property to simplify log 6 24 + 2 log 6 3. 2 3 = 8. Logarithms can be simplified using only one property or a combination of all 3 properties. log 4 x = log 16. x log 4 = log 16. Using log 10 ("log to the base 10"): log 10 100 = 2 is equivalent to 10 2 = 100 where 10 is the base, 2 is the logarithm (i.e., the exponent or power) and 100 is the number. Scientists use the Richter scale to compare the seriousness of earthquakes. Bankers use natural logarithms to calculate the time required for a sum of money deposited at an interest rate to reach the desired balance. In general, you write log followed by the base number as a subscript. Simplify log 3 40 - log 3 10. The increase from a 4.0 earthquake to a 5.0 quake is tenfold. If you wanted, you could use two as a base unit. You can divide both sides of the equation by log 4 to get x by itself. Where A is the amplitude (in mm) measured by the Seismograph and B is a distance correction factor. Remember that log 4 is a number. More examples showing how to simplify logarithms. To solve log 2 ( x – 1) + log 2 3 = 5, for instance, first combine the two logs that are adding into one log by using the product rule: Using natural logs (log e or ln): Carrying all numbers to 5 significant figures, ln 30 = 3.4012 is equivalent to e 3.4012 = 30 or 2.7183 3.4012 = 30 The magnitude of an earthquake is a Logarithmic scale. For instance, the base two logarithm of eight is three, because two raised to the power of three equals eight: log 2 8 = 3 because . Use a calculator to evaluate the logarithms … x log 4 = log 16. Exercise #1. There are logarithms using different base units. The famous "Richter Scale" uses this formula: M = log 10 A + B. Sound .