Understanding Domains of Composite Functions

The video tutorial explains how to determine the domain of composite functions F(G(x)) and G(F(x)) using graphs of F(x) and G(x). It highlights the challenges of not having explicit equations and focuses on analyzing the domain and range of individual functions. The tutorial provides step-by-step guidance on identifying restrictions and ensuring the outputs of inner functions are valid inputs for outer functions, using graphical analysis.

What is the main challenge in finding the domain of composite functions F(G(x)) and G(F(x))?

• Too many variables involved

• Complexity of the functions

• Absence of equations for F(x) and G(x)

• Lack of graph for F(x) and G(x)

What is the domain of F(x) given a vertical asymptote at x = 0?

• x > 0

• All real numbers

• x ≠ 0

• x < 0

What is the range of G(x) if the graph goes up and down forever?

• x > 0

• x ≠ 0

• All real numbers

• x < 0

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When determining the domain of F(G(x)), what must be considered?

• The graph of G(x)

• The range of F(x)

• The domain of F(x)

• The outputs of G(x) as inputs to F(x)

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Why must x = 1 be excluded from the domain of F(G(x))?

• It produces an output of zero in G(x)

• It is a vertical asymptote

• It is not in the domain of G(x)

• It is not in the range of F(x)

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What is the domain of F(G(x)) after considering all restrictions?

• (0, ∞)

• (0, 1) ∪ (1, ∞)

• (1, ∞)

• (0, 1)

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What is the initial step in determining the domain of G(F(x))?

• Check the graph of G(x)

• Check the graph of F(x)

• Check the domain of F(x)

• Check the range of G(x)

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Why must certain x values be excluded from the domain of G(F(x))?

• They produce outputs not in the domain of G(x)

• They are not in the range of G(x)

• They are vertical asymptotes

• They are not in the domain of F(x)

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CCSS.HSF-BF.A.1B

What is the domain of G(F(x)) after applying all necessary restrictions?

• (0, ∞)

• (0, 1)

• (1, ∞)

• (0, 1) ∪ (1, ∞)

What is a key takeaway from the examples provided in the video?

• Composite functions are always easy to solve

• Determining domains graphically can be challenging

• Equations are not needed for domain determination

• Graphical determination of domains is straightforward