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M3-020-A10-V04
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F-BF.4.a
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M3-020-A10-V04
Find inverse functions for simple invertible functions, including rational examples.
Restrict to monotonic branches and write both inverses
Problem
For \(f(x)~=~|x~-~4|~+~1\), state the turning point, restrict the function to each monotonic branch, write \(\text{both}~\text{inverse}~\text{functions}\), and give the branch ranges and inverse domains.
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A
Turning point: (4,1). Branches: increasing on x≤4 with inverse x+3; decreasing on x≥4 with inverse 5−x. Both branch ranges and inverse domains are [1,∞), and each restriction is one-to-one.
B
Turning point: (4,1). Branches: increasing on x≥4 with inverse x+3; decreasing on x≤4 with inverse 5−x. Both branch ranges and inverse domains are [1,∞), and each restriction is one-to-one.
C
Turning point: (4,1). Branches: increasing and decreasing on all real x, with inverses x+3 and 5−x. The range and inverse domain are [1,∞), and each unrestricted branch is one-to-one.
D
Turning point: (4,1). Branches: increasing on x≥4 with inverse x−3; decreasing on x≤4 with inverse 5−x. Both branch ranges and inverse domains are [1,∞), and each restriction is one-to-one.
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Curriculum context
Standard F-BF.4.a
Category Functions
Domain Building Functions
Objective Find inverse functions for simple invertible functions, including rational examples.
Problem type Restrict to monotonic branches and write both inverses