# How to condense logarithms with different bases in a relationship

### Calculus I - Logarithmic Differentiation

Use properties of logarithms to expand or condense logarithmic expressions. , a logarithmic function is used to model the relationship between the number of used, you may occasionally need to evaluate logarithms with other bases. How can you use properties of exponents to derive properties of logarithms? 5. Use the Use the properties of logarithms to expand or condense logarithmic expressions. Use the Because of this relationship, it makes sense that logarithms. Use properties of exponents to rewrite the denominator. In addition to shifting, compressing, and stretching a graph, we can also reflect it about the x-axis or the y-axis. .. We can express the relationship between logarithmic form and its.

Tables for natural logarithms also exist. Since for natural logarithms, there is no easy way of determining the characteristic, the table will show both characteristic and mantissa. It will also cover a greater range of numbers, perhaps 0 to or more. Logarithms are used for a variety of purposes. One significant use—the use for which they were first invented—is to simplify calculations. Laws I and II enable one to multiply or divide numbers by adding or subtracting their logarithms.

When numbers have a large number of digits, adding or subtracting is usually easier. Law III enables one to raise a number to a power by multiplying its logarithm. This is a much simpler operation than doing the exponentiation, especially if the exponent is not 0, 1, or 2. At one time logarithms were widely used for computation. Astronomers relied on them for the extensive computations their work requires.

Engineers did a majority of their computations with slide rules, which are mechanical devices for adding and subtracting logarithms or, using log-log scales, for multiplying them.

Modern electronic calculators have displaced slide rules and tables for computational purposes—they are quicker and far more precise—but an understanding of the properties of logarithms remains a valuable tool for anyone who uses numbers extensively. If one draws a scale on which logarithms go up by uniform steps, the antilogarithms will crowd closer and closer together as their size increases.

## Logarithmic Equation Calculator

They do this in a very systematic way. On a logarithmic scale, as this is called, equal intervals correspond to equal ratios. The interval between 1 and 2, for example, is the same length as the interval between 4 and 8. Logarithmic scales are used for many purposes. The pH scale used to measure acidity and the decibel scale used to measure loudness are both logarithmic scales that is, they are the logarithms of the acidity and loudness. As such, they stretch out the scale where the acidity or loudness is weak and small variations noticeable and compress it where it is strong where big variations are needed for a noticeable effect.

Another example of the advantage of a logarithmic scale can be seen in a scale which a sociologist might construct. If he were to draw an ordinary graph of family incomes, an increase of a dollar an hour in the minimum wage would seem to be of the same importance as a dollar-an-hour increase in the income of a corporation executive earning a half million dollars a year. Yet such an increase would be of far greater importance to the family whose earner or earners were working at the minimum-wage level.

A logarithmic scale, where equal intervals reflect equal ratios rather than equal differences, would show this. Logarithmic functions also show up as the inverses of exponential functions. A demographer wanting to know how long it would take for the population to grow to a certain size would find the logarithmic form of the relationship the more useful one.

The invention of logarithms is attributed to John Napiera Scottish mathematician who lived from to The logarithms he invented, however, were not the simple logarithms we use today his logarithms were not what are now called "Napierian".

Shortly after Napier published his work, Briggs, an English mathematician met with him and together they worked out logarithms that much more closely resemble the common logarithms that we use today. Neither Napier nor Briggs related logarithms to exponents, however.

They were invented before exponents were in use. Resources books Finney, Thomas, Demana, and Waits. Addison Wesley Publishing Co. Gullberg, Jan, and Peter Hilton. From the Birth of Numbers. Some of that energy can be very dangerous to living organisms. Some of the lower levels of energy can be used by medical professionals to help people who are suffering from cancer.

The isotope Plutonium is used for the production of nuclear bombs and it is part of the composition of nuclear waste. It has a halflife of 24, years. This means it takes 24, to lose half of its energy. We are going to use this isotope for the following problem.

### Simplification of different base logarithms - Mathematics Stack Exchange

How long would it take for the plutonium to degrade to 0. Let us examine a table that describes this slow process. The formula that encapsulates this table of information is this.

We want to know when the material will degrade to 0.

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• Logarithms

This means we must use that value for M. To solve this equation, we need to divide both sides by This gives us this equation. The variable is part of the exponent. In order to move the variable out of that position, we will use Logarithm Property Three. We will need to take the log of both sides, first.

Now, we will move the exponent in front of the log, using the third property. This gives us much closer to our final goal. Our next step involves multiplying both sides by 24, This is what needs to be placed into a calculator. Placing it into a calculator, we get this value.