Domain And Range Of Logarithmic Functions From Equation Worksheet

Algebra 2
Exponential Functions

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How Will This Worksheet on "Domain and Range of Logarithmic Functions from Equation" Benefit Your Student's Learning?

  • Helps students grasp what logarithms are and how they work.
  • Enhances skills in analyzing equations to determine permissible inputs (domain) and possible outputs (range).
  • Makes it easier to solve real-world problems, like how things grow or shrink over time.
  • Promotes critical thinking as students analyze how changes in the function's parameters affect its domain and range.
  • Strengthens understanding of algebraic transformations affecting domain and range such as shifts and stretches.

How to Domain and Range of Logarithmic Functions from an Equation?

  • Recognize the logarithmic function in the form \( y = \log_b(x) \), where \( b > 0 \) and \( b \neq 1 \).
  • Logarithmic functions are defined for \( x > 0 \) because the logarithm of zero or a negative number is undefined in real numbers.
  • The range of \( y = \log_b(x) \) includes all real numbers (\( y \in \mathbb{R} \)) because logarithmic functions can yield any real value depending on the input \( x \).
  • Recognize how changes in the base \( b \) and any transformations affect the domain and range, such as shifts left or right on the `x`-axis and vertical stretches or compressions on the `y`-axis.

Solved Example

Q. What is the domain of this logarithmic function?y=log9(x+1)+3\newline y=\log_9(x+1)+3\newlineExpress the domain in inequality notation.
Solution:
  1. Identify Argument: Identify the argument of the logarithm.\newlineArgument: x+1 x + 1
  2. Set Inequality: Set the argument greater than 00.\newlinex+1>0 x + 1 > 0
  3. Solve Inequality: Solve the inequality.\newlinex>1 x > -1
  4. Write Domain: Write the domain in interval notation.\newlineDomain: x>1 x > -1 or (1,) (-1, \infty)
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About Worksheet

Algebra 2
Exponential Functions

Understanding the domain and range of logarithmic functions from an equation involves identifying permissible inputs (domain) and resulting outputs (range). For \( y = \log_b(x) \), the domain is \( x > 0 \) since logarithms are only defined for positive numbers, and the range is all real numbers (\( y \in \mathbb{R} \)). Reviewing a domain and range of logarithmic functions from equation examples and practicing with domain and range of logarithmic functions from equation questions solidifies these concepts.

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