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Transcript of Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule...
![Page 1: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/1.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the parent absolute-value function f(x) = |x| has a V shape with a minimum point or vertex at (0, 0).
![Page 2: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/2.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
The absolute-value parent function is composed of two linear pieces, one with a slope of –1 and one with a slope of 1. In Lesson 2-6, you transformed linear functions. You can also transform absolute-value functions.
![Page 3: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/3.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
The general form for translations are
Vertical: k
Horizontal: h
g(x) = |x – (h) | + k
Remember!
![Page 4: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/4.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 1A: Translating Absolute-Value Functions
Perform the transformation on f(x) = |x|. Then graph the transformed function g(x).
5 units down
Substitute.
The graph of g(x) = |x| – 5 is the graph of f(x) = |x| after a vertical shift of 5 units down. The vertex of g(x) is (0, –5).
f(x) = |x|
g(x) = f(x) + k
g(x) = |x| – 5
![Page 5: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/5.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 1A Continued
The graph of g(x) = |x|– 5 is the graph of f(x) = |x| after a vertical shift of 5 units down. The vertex of g(x) is (0, –5).
f(x)
g(x)
![Page 6: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/6.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 1B: Translating Absolute-Value Functions
Perform the transformation on f(x) = |x|. Then graph the transformed function g(x).
1 unit left
Substitute.
f(x) = |x|
g(x) = f(x – h )
g(x) = |x – (–1)| = |x + 1|
![Page 7: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/7.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 1B Continued
f(x)
g(x)
The graph of g(x) = |x + 1| is the graph of f(x) = |x| after a horizontal shift of 1 unit left. The vertex of g(x) is (–1, 0).
![Page 8: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/8.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
4 units down
Substitute.
f(x) = |x|
g(x) = f(x) + k
g(x) = |x| – 4
Check It Out! Example 1a
Let g(x) be the indicated transformation of f(x) = |x|. Write the rule for g(x) and graph the function.
![Page 9: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/9.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
f(x)
g(x)
Check It Out! Example 1a Continued
The graph of g(x) = |x| – 4 is the graph of f(x) = |x| after a vertical shift of 4 units down. The vertex of g(x) is (0, –4).
![Page 10: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/10.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Perform the transformation on f(x) = |x|. Then graph the transformed function g(x).
2 units right
Substitute.
f(x) = |x|
g(x) = f(x – h)
g(x) = |x – 2| = |x – 2|
Check It Out! Example 1b
![Page 11: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/11.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
f(x)
g(x)
Check It Out! Example 1b Continued
The graph of g(x) = |x – 2| is the graph of f(x) = |x| after a horizontal shift of 2 units right. The vertex of g(x) is (2, 0).
![Page 12: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/12.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Because the entire graph moves when shifted, the shift from f(x) = |x| determines the vertex of an absolute-value graph.
![Page 13: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/13.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 2: Translations of an Absolute-Value Function
Translate f(x) = |x| so that the vertex is at (–1, –3). Then graph.
g(x) = |x – h| + k
g(x) = |x – (–1)| + (–3) Substitute.
g(x) = |x + 1| – 3
![Page 14: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/14.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 2 Continued
The graph confirms that the vertex is (–1, –3).
f(x)
The graph of g(x) = |x + 1| – 3 is the graph of f(x) = |x| after a vertical shift down 3 units and a horizontal shift left 1 unit.
g(x)
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Holt Algebra 2
2-9 Absolute–Value Functions
Check It Out! Example 2
Translate f(x) = |x| so that the vertex is at (4, –2). Then graph.
g(x) = |x – h| + k
g(x) = |x – 4| + (–2) Substitute.
g(x) = |x – 4| – 2
![Page 16: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/16.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
The graph confirms that the vertex is (4, –2).
Check It Out! Example 2 Continued
g(x)
The graph of g(x) = |x – 4| – 2 is the graph of f(x) = |x| after a vertical down shift 2 units and a horizontal shift right 4 units.
f(x)
![Page 17: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/17.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Reflection across x-axis: g(x) = –f(x)
Reflection across y-axis: g(x) = f(–x)
Remember!
Absolute-value functions can also be stretched, compressed, and reflected.
Vertical stretch and compression : g(x) = af(x)
Horizontal stretch and compression: g(x) = f
Remember!
![Page 18: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/18.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 3A: Transforming Absolute-Value Functions
Perform the transformation. Then graph.
g(x) = f(–x)
g(x) = |(–x) – 2| + 3
Take the opposite of the input value.
Reflect the graph. f(x) =|x – 2| + 3 across the y-axis.
![Page 19: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/19.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
g f
Example 3A Continued
The vertex of the graph g(x) = |–x – 2| + 3 is (–2, 3).
![Page 20: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/20.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
g(x) = af(x)
g(x) = 2(|x| – 1) Multiply the entire function by 2.
Example 3B: Transforming Absolute-Value Functions
Stretch the graph. f(x) = |x| – 1 vertically by a factor of 2.
g(x) = 2|x| – 2
![Page 21: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/21.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 3B Continued
The graph of g(x) = 2|x| – 2 is the graph of f(x) = |x| – 1 after a vertical stretch by a factor of 2. The vertex of g is at (0, –2).
f(x) g(x)
![Page 22: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/22.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Example 3C: Transforming Absolute-Value Functions
Compress the graph of f(x) = |x + 2| – 1 horizontally by a factor of .
g(x) = |2x + 2| – 1 Simplify.
Substitute for b.
![Page 23: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/23.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
f
The graph of g(x) = |2x + 2|– 1 is the graph of
f(x) = |x + 2| – 1 after a horizontal compression by a
factor of . The vertex of g is at (–1, –1).
Example 3C Continued
g
![Page 24: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/24.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Perform the transformation. Then graph.
g(x) = f(–x)
g(x) = –|–x – 4| + 3
Take the opposite of the input value.
Reflect the graph. f(x) = –|x – 4| + 3 across the y-axis.
Check It Out! Example 3a
g(x) = –|(–x) – 4| + 3
![Page 25: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/25.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
The vertex of the graph g(x) = –|–x – 4| + 3 is (–4, 3).
Check It Out! Example 3a Continued
fg
![Page 26: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/26.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Compress the graph of f(x) = |x| + 1 vertically
by a factor of .
Simplify.
Check It Out! Example 3b
g(x) = a(|x| + 1)
g(x) = (|x| + 1)
g(x) = (|x| + )
Multiply the entire function by .
![Page 27: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/27.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Check It Out! Example 3b Continued
f(x)
g(x)
The graph of g(x) = |x| + is the graph of
g(x) = |x| + 1 after a vertical compression by a
factor of . The vertex of g is at ( 0, ).
![Page 28: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/28.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Substitute 2 for b.
Stretch the graph. f(x) = |4x| – 3 horizontally by a factor of 2.
g(x) = |2x| – 3
Check It Out! Example 3c
Simplify.
g(x) = f( x)
g(x) = | (4x)| – 3
![Page 29: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/29.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Check It Out! Example 3c Continued
g
The graph of g(x) = |2x| – 3 the graph of f(x) = |4x| – 3 after a horizontal stretch by a factor of 2. The vertex of g is at (0, –3).
f
![Page 30: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/30.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Lesson Quiz: Part I
1. Translate f(x) = |x| 3 units right.Perform each transformation. Then graph.
g(x)=|x – 3|g
f
![Page 31: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/31.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Lesson Quiz: Part II
Perform each transformation. Then graph.
g(x)=|x – 2| – 1
2. Translate f(x) = |x| so the vertex is at (2, –1). Then graph.
f
g
![Page 32: Holt Algebra 2 2-9 Absolute–Value Functions An absolute-value function is a function whose rule contains an absolute-value expression. The graph of the.](https://reader030.fdocuments.net/reader030/viewer/2022032709/56649eb65503460f94bbef81/html5/thumbnails/32.jpg)
Holt Algebra 2
2-9 Absolute–Value Functions
Lesson Quiz: Part III
g(x)= –3|2x| + 3
3. Stretch the graph of f(x) = |2x| – 1 vertically by a factor of 3 and reflect it across the x-axis.
Perform each transformation. Then graph.