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# Type I - Logarithm Bases

Extracts from this document...

Introduction

Math Portfolio- Logarithm Bases

Consider the following sequences: Find the nth term plus the general statement for each term.

Log2 8, Log4 8, Log8 8, Log16 8, Log32 8, ….

Firstly looking at this sequence the base value is the only number that changes throughout the sequence. The base of the logs in the sequence consists of:

2, 4, 8, 16, 32 …

This value is seems like it is doubling each time. This means that the next two values for the base is going to be:

32 × 2 = 64

64 × 2 = 128

However, when examining the sequence closely the base of the logs cannot be doubling because this means that the nth term is Log2n 8. This is invalid and wrong because if you substitute positive integers for n, the sequence does not appear to be the same. When adding the next two terms to the sequence, the sequence will look as shown:

Log2 8, Log4 8, Log8 8, Log16 8, Log32 8, Log64 8, Log128 8, …

The nth term for this sequence is Log2n8. This can be simplified and written like this, Log2n23. This proves that the next two base values of the logs are 64 and 128 because 26 = 64 and 27 = 128.

The next sequence is:

Log3 81, Log9 81, Log27 81, Log81 81, …

In this sequence, when examining the base values for each term, the value is tripling; this means that the nth term is Log3n81.

Middle

. (y = )

The graph below represents a graph of Log2n23. (y = Log2n23)

Analyzing the graphs shown above, you can see that both of the graphs are exactly identical. This fully justifies that both of these equations are exactly the same, and it proves that the expressions for the sequence is equal as well. They are both equal.

The graph below represents a graph of  . (y = )

The graph below represents a graph of Log3n34, where y = of Log3n34.

Analyzing each graph, this is also a justification to the main expression because this follows the concept that the expressions defining the sequences are equal.

The graph below represents a graph of  . (y = )

The graph below represents a graph of Log5n52, where y = of Log5n52.

Looking at these two graphs, again this is obvious that the graphs are identical. Therefore, this proves that the expressions/formulas for the sequence are equal and is valid. Therefore, this means that this is justified and proved.

This method of writing the expression for the log in this form,   , can then be a way to calculate the actual answer of the Log. The following Logs are answered in this form below:

Log4 64, Log8 64, Log32 64, …

Log4 64 =

or Log4 64 = Log2226

=

== = 3

Log8 64 =

or Log8 64 = Log2326

=

= = = 2

Log32 64 =

or Log8 64 = Log2526

=

= = = 1.2

Conclusion

1/125 125 = =

= This equals,= = -1

Log1/625 125 = =

= This equals,=

Using the other form, to find Log1/625 125, you must:

== =

The fourth sequence is:

Log8 512, Log2 512, Log16 512, …

Log8 512 = =

This equals,= = 3

Log2 512 = =

= This equals,= = 9

Log16 512 = =

= This equals,=

Using the other form, to find Log16 512, you must:

=  =

Letting Loga X = c and Log b X = d, we can further create a general statement similar to the 2nd way of calculating the logs. (Shown above) ().

Finding the general statement that expresses Logab X, in terms of c and d is shown in the following steps:

1. Firstly we know that because of the rules of logarithms, =
2. The second step is to simplify this formula into its simplest form and you should have the complete general statement that expresses Logab X, in terms of c and d.

=  = = =  = .

Arriving at this general statement relates heavily to the fact about the rules of logarithms. These rules help find the final general statement that expresses the each term and answer for each term.

The Scope and Limitations:

There are a couple of limitations to this general statement. First is that for the base of all logarithms, you cannot have a negative integer for these values. This means that for a and b the numbers cannot be negative. Furthermore, this shows means that x, a and b must be greater than zero. Another way of expressing this is that the domain of this general statement must be all positive real numbers.

This student written piece of work is one of many that can be found in our International Baccalaureate Maths section.

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