Precalculus : Graph Logarithms

Example Questions

Example Question #11 : Logarithmic Functions

What is the domain of the function       Explanation:

The function is undefined unless . Thus is undefined unless because the function has been shifted left.

Example Question #101 : Exponential And Logarithmic Functions

What is the range of the function       Explanation:

To find the range of this particular function we need to first identify the domain. Since we know that is a bound on our function.

From here we want to find the function value as approaches .

To find this approximate value we will plug in into our original function.    This is our lowest value we will obtain. As we plug in large values we get large function values.

Therefore our range is: Example Question #101 : Exponential And Logarithmic Functions

Which of the following logarithmic functions match the provided diagram?       Explanation:

Looking at the diagram, we can see that when  . Since represents the exponent and represents the product, and any base with an exponent of 1 equals the base, we can determine the base to be 0.5.

Example Question #1 : Graph Logarithms

Which of the following diagrams represents the graph of the following logarithmic function?       Explanation:

For , is the exponent of base 5 and is the product. Therefore, when  and when  . As a result, the correct graph will have values of 5 and 125 at and , respectively.

Example Question #1 : Graph Logarithms

Which of the following diagrams matches the given logarithmic function:       Explanation:

For this function, represents the exponent and y represents the product of the base 2 and its exponent. On the diagram, it is clear that as the value increases, the value increases exponentially and at , . Those two characteristics of the graph indicate that x is the exponent value and the base is equal to 2.

Example Question #6 : Graph Logarithms

Which of the following logarithmic functions match the given diagram?       Explanation:

Looking at the graph, the y-value diminishes exponentially as decreases and increases rapidly as the x-value increases, which indicates that is the exponent value for the equation.

Also, when and when , which can be expressed as and , respectively.

This indicates that the diagram is consistent with the function .

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