What is the parent function of a logarithmic function?
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Emily Adams
Studied at University of California, Los Angeles (UCLA), Lives in Los Angeles, CA
Hello there, I'm an expert in the field of mathematical functions, and I'm here to help you understand the intricacies of logarithmic functions and their parent functions. Let's delve into the topic.
The parent function of a logarithmic function is a specific form of a logarithmic function that serves as a baseline or reference point for understanding the behavior of more complex logarithmic functions. It's the simplest form of a logarithmic function that retains the essential characteristics of the family of logarithmic functions.
In mathematics, the logarithmic function is defined as the inverse of the exponential function. The general form of a logarithmic function is:
\[ y = \log_b(x) \]
where \( b \) is the base of the logarithm, and \( x \) is the argument of the logarithm. The base \( b \) must be greater than 0 and not equal to 1 for the logarithm to be defined.
Now, let's discuss the properties of the parent logarithmic function:
1. Domain: The domain of the parent logarithmic function \( \log_b(x) \) is all positive real numbers, \( x > 0 \). This is because you cannot take the logarithm of a non-positive number in the real number system.
2. Range: The range of the parent function is all real numbers, \( y \in \mathbb{R} \).
3. End Behavior: As \( x \) approaches 0 from the right (i.e., \( x \) gets very small but remains positive), \( y \) approaches negative infinity. As \( x \) approaches infinity, \( y \) approaches infinity.
4. Continuity: The parent logarithmic function is continuous for all \( x > 0 \).
5. Shape: The graph of the parent function is a curve that increases slowly as \( x \) increases, especially as \( x \) gets larger. It never touches the \( x \)-axis because the logarithm of 0 is undefined.
Now, let's consider the transformation of the parent function. If we have a logarithmic function in the form:
\[ y - C_2 = \log_b(x - C_1) \]
To find the corresponding exponential function, we would perform the following steps:
1. Isolate \( y \) on one side of the equation:
\[ y = C_2 + \log_b(x - C_1) \]
2. Apply the definition of the exponential function as the inverse of the logarithm:
\[ y - C_2 = \log_b(x - C_1) \]
\[ b^{(y - C_2)} = x - C_1 \]
3. Solve for \( x \) to get the exponential form:
\[ x = b^{(y - C_2)} + C_1 \]
The exponential form of the given logarithmic function is \( x = b^{(y - C_2)} + C_1 \), and this is how you can find the exponential function that corresponds to a given logarithmic function.
Now, to find the inverse function, we would swap \( x \) and \( y \) and solve for the new \( y \) (which would be the \( x \) in the original function):
1. Swap \( x \) and \( y \) in the original equation:
\[ x - C_2 = \log_b(y - C_1) \]
2. Solve for the new \( y \) (which is the inverse function):
\[ b^{x - C_2} = y - C_1 \]
\[ y = b^{x - C_2} + C_1 \]
The inverse function of the given logarithmic function is \( y = b^{x - C_2} + C_1 \). This inverse function is an exponential function because it is the inverse of the logarithmic function.
In summary, the parent function of a logarithmic function is \( y = \log_b(x) \), and understanding its properties and transformations is crucial for grasping the behavior of more complex logarithmic functions. The exponential function that corresponds to a given logarithmic function can be found by applying the definition of the exponential as the inverse of the logarithm, and the inverse function can be found by swapping and solving for the new variable.
The parent function of a logarithmic function is a specific form of a logarithmic function that serves as a baseline or reference point for understanding the behavior of more complex logarithmic functions. It's the simplest form of a logarithmic function that retains the essential characteristics of the family of logarithmic functions.
In mathematics, the logarithmic function is defined as the inverse of the exponential function. The general form of a logarithmic function is:
\[ y = \log_b(x) \]
where \( b \) is the base of the logarithm, and \( x \) is the argument of the logarithm. The base \( b \) must be greater than 0 and not equal to 1 for the logarithm to be defined.
Now, let's discuss the properties of the parent logarithmic function:
1. Domain: The domain of the parent logarithmic function \( \log_b(x) \) is all positive real numbers, \( x > 0 \). This is because you cannot take the logarithm of a non-positive number in the real number system.
2. Range: The range of the parent function is all real numbers, \( y \in \mathbb{R} \).
3. End Behavior: As \( x \) approaches 0 from the right (i.e., \( x \) gets very small but remains positive), \( y \) approaches negative infinity. As \( x \) approaches infinity, \( y \) approaches infinity.
4. Continuity: The parent logarithmic function is continuous for all \( x > 0 \).
5. Shape: The graph of the parent function is a curve that increases slowly as \( x \) increases, especially as \( x \) gets larger. It never touches the \( x \)-axis because the logarithm of 0 is undefined.
Now, let's consider the transformation of the parent function. If we have a logarithmic function in the form:
\[ y - C_2 = \log_b(x - C_1) \]
To find the corresponding exponential function, we would perform the following steps:
1. Isolate \( y \) on one side of the equation:
\[ y = C_2 + \log_b(x - C_1) \]
2. Apply the definition of the exponential function as the inverse of the logarithm:
\[ y - C_2 = \log_b(x - C_1) \]
\[ b^{(y - C_2)} = x - C_1 \]
3. Solve for \( x \) to get the exponential form:
\[ x = b^{(y - C_2)} + C_1 \]
The exponential form of the given logarithmic function is \( x = b^{(y - C_2)} + C_1 \), and this is how you can find the exponential function that corresponds to a given logarithmic function.
Now, to find the inverse function, we would swap \( x \) and \( y \) and solve for the new \( y \) (which would be the \( x \) in the original function):
1. Swap \( x \) and \( y \) in the original equation:
\[ x - C_2 = \log_b(y - C_1) \]
2. Solve for the new \( y \) (which is the inverse function):
\[ b^{x - C_2} = y - C_1 \]
\[ y = b^{x - C_2} + C_1 \]
The inverse function of the given logarithmic function is \( y = b^{x - C_2} + C_1 \). This inverse function is an exponential function because it is the inverse of the logarithmic function.
In summary, the parent function of a logarithmic function is \( y = \log_b(x) \), and understanding its properties and transformations is crucial for grasping the behavior of more complex logarithmic functions. The exponential function that corresponds to a given logarithmic function can be found by applying the definition of the exponential as the inverse of the logarithm, and the inverse function can be found by swapping and solving for the new variable.
2024-05-10 20:17:25
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Studied at the University of São Paulo, Lives in São Paulo, Brazil.
So if you can find the graph of the parent function logb x, you can transform it. ... If y -C 2 = log3(x -C 1) is the logarithmic function, 3y -C 2 = x -C 1 is the exponential; the inverse function is 3x -C 2 = y -C 1 because x and y switch places in the inverse. Solve for the variable not in the exponential of the inverse.
2023-06-16 20:01:53
Charlotte Wilson
QuesHub.com delivers expert answers and knowledge to you.
So if you can find the graph of the parent function logb x, you can transform it. ... If y -C 2 = log3(x -C 1) is the logarithmic function, 3y -C 2 = x -C 1 is the exponential; the inverse function is 3x -C 2 = y -C 1 because x and y switch places in the inverse. Solve for the variable not in the exponential of the inverse.
