holt algebra 2 8-7 radical functions 8-7 radical functions holt algebra 2 warm up warm up lesson...
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Holt Algebra 2
8-7 Radical Functions 8-7 Radical Functions
Holt Algebra 2
Warm UpWarm Up
Lesson PresentationLesson Presentation
Lesson QuizLesson Quiz
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Holt Algebra 2
8-7 Radical Functions
radical functionsquare-root function
Vocabulary
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Holt Algebra 2
8-7 Radical Functions
A radical function is a function whose rule is a radical expression. A square-root function is a radical function involving . The square-root parent function is . The cube-root parent function is .
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Holt Algebra 2
8-7 Radical Functions
Graph each function and identify its domain and range.
Example 1A: Graphing Radical Functions
Make a table of values. Plot enough ordered pairs to see the shape of the curve. Because the square root of a negative number is imaginary, choose only nonnegative values for x – 3.
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Holt Algebra 2
8-7 Radical Functions
Example 1A Continued
x (x, f(x))3 (3, 0)
4 (4, 1)
7 (7, 2)
12 (12, 3)
The domain is {x|x ≥3}, and the range is {y|y ≥0}.
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Holt Algebra 2
8-7 Radical Functions
Graph each function and identify its domain and range.
Example 1B: Graphing Radical Functions
Make a table of values. Plot enough ordered pairs to see the shape of the curve. Choose both negative and positive values for x.
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Holt Algebra 2
8-7 Radical Functions
x (x, f(x))–6 (–6, –4)
1 (1,–2)
2 (2, 0)
3 (3, 2)
10 (10, 4)
Example 1B Continued
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●●
●●
The domain is the set of all real numbers. The range is also the set of all real numbers
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Holt Algebra 2
8-7 Radical Functions
Example 1B Continued
Check Graph the function on a graphing calculator.
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Holt Algebra 2
8-7 Radical Functions
Graph each function and identify its domain and range.
Make a table of values. Plot enough ordered pairs to see the shape of the curve. Choose both negative and positive values for x.
Check It Out! Example 1a
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Holt Algebra 2
8-7 Radical Functions
x (x, f(x))–8 (–8, –2)
–1 (–1,–1)
0 (0, 0)
1 (1, 1)
8 (8, 2)
•
• •
• •
The domain is the set of all real numbers. The range is also the set of all real numbers.
Check It Out! Example 1a Continued
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Holt Algebra 2
8-7 Radical Functions
Check Graph the function on a graphing calculator.
Check It Out! Example 1a Continued
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Holt Algebra 2
8-7 Radical Functions
x (x, f(x))–1 (–1, 0)
3 (3, 2)
8 (8, 3)
15 (15, 4)
The domain is {x|x ≥ –1}, and the range is {y|y ≥0}.
•
••
•
Check It Out! Example 1b
Graph each function, and identify its domain and range.
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Holt Algebra 2
8-7 Radical Functions
The graphs of radical functions can be transformed by using methods similar to those used to transform linear, quadratic, polynomial, and exponential functions. This lesson will focus on transformations of square-root functions.
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Holt Algebra 2
8-7 Radical Functions
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Holt Algebra 2
8-7 Radical Functions
Using the graph of as a guide, describe the transformation and graph the function.
Example 2: Transforming Square-Root Functions
Translate f 5 units up.
•
•
g(x) = x + 5
f(x) = x
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Holt Algebra 2
8-7 Radical Functions
Using the graph of as a guide, describe the transformation and graph the function.
Translate f 1 unit up. ••
Check It Out! Example 2a
g(x) = x + 1
f(x)= x
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Holt Algebra 2
8-7 Radical Functions
Using the graph of as a guide, describe the transformation and graph the function.
Check It Out! Example 2b
g is f vertically compressed
by a factor of .1
2
f(x) = x
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Holt Algebra 2
8-7 Radical Functions
Transformations of square-root functions are summarized below.
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Holt Algebra 2
8-7 Radical Functions
Example 3: Applying Multiple Transformations
Reflect f across the x-axis, and translate it 4 units to the right.
••
Using the graph of as a guide, describe the transformation and graph the function .
f(x)= x
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Holt Algebra 2
8-7 Radical Functions
g is f reflected across the y-axis and translated 3 units up. ●
●
Check It Out! Example 3a
Using the graph of as a guide, describe the transformation and graph the function.
f(x)= x
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Holt Algebra 2
8-7 Radical Functions
g is f vertically stretched by a factor of 3, reflected across the x-axis, and translated 1 unit down.
●●
Check It Out! Example 3b
Using the graph of as a guide, describe the transformation and graph the function.
f(x)= x
g(x) = –3 x – 1
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Holt Algebra 2
8-7 Radical Functions
Example 4: Writing Transformed Square-Root Functions
Step 1 Identify how each transformation affects the function.
Reflection across the x-axis: a is negative
Translation 5 units down: k = –5
Vertical compression by a factor of 15
15
a = –
Use the description to write the square-root
function g. The parent function is
reflected across the x-axis, compressed vertically
by a factor of , and translated down 5 units.
15
f(x)= x
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Holt Algebra 2
8-7 Radical Functions
Example 4 Continued
Step 2 Write the transformed function.
Simplify.
Substitute – for a and –5 for k.15
15
g(x) = x + ( 5)
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Holt Algebra 2
8-7 Radical Functions
Example 4 Continued
Check Graph both functions on a graphing calculator. The g indicates the given transformations of f.
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Holt Algebra 2
8-7 Radical Functions
Use the description to write the square-root function g.
Check It Out! Example 4
The parent function is reflected across the x-axis, stretched vertically by a factor of 2, and translated 1 unit up.
Step 1 Identify how each transformation affects the function.
Reflection across the x-axis: a is negative
Translation 5 units down: k = 1
Vertical compression by a factor of 2 a = –2
f(x)= x
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Holt Algebra 2
8-7 Radical Functions
Simplify.
Substitute –2 for a and 1 for k.
Step 2 Write the transformed function.
Check Graph both functions on a graphing calculator. The g indicates the given transformations of f.
Check It Out! Example 4 Continued
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Holt Algebra 2
8-7 Radical Functions
In addition to graphing radical functions, you can also graph radical inequalities. Use the same procedure you used for graphing linear and quadratic inequalities.
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Holt Algebra 2
8-7 Radical Functions
Example 6: Graphing Radical Inequalities
x 0 1 4 9
y –3 –1 1 3
Graph the inequality .
Step 1 Use the related equation to make a table of values.
y =2 x 3
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Holt Algebra 2
8-7 Radical Functions
Example 6 Continued
Step 2 Use the table to graph the boundary curve. The inequality sign is >, so use a dashed curve and shade the area above it.
Because the value of x cannot be negative, do not shade left of the y-axis.
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Holt Algebra 2
8-7 Radical Functions
Example 6 Continued
Check Choose a point in the solution region, such as (1, 0), and test it in the inequality.
0 > 2(1) – 3
0 > –1
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Holt Algebra 2
8-7 Radical Functions
Graph the inequality.
x –4 –3 0 5
y 0 1 2 3
Check It Out! Example 6a
Step 1 Use the related equation to make a table of values.
y = x+4
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Holt Algebra 2
8-7 Radical Functions
Step 2 Use the table to graph the boundary curve. The inequality sign is >, so use a dashed curve and shade the area above it.
Because the value of x cannot be less than –4, do not shade left of –4.
Check It Out! Example 6a Continued
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Holt Algebra 2
8-7 Radical Functions
Check Choose a point in the solution region, such as (0, 4), and test it in the inequality.
4 > (0) + 4
4 > 2
Check It Out! Example 6a Continued
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Holt Algebra 2
8-7 Radical Functions
Graph the inequality.
x –4 –3 0 5
y 0 1 2 3
Check It Out! Example 6b
Step 1 Use the related equation to make a table of values.
3y x 3
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Holt Algebra 2
8-7 Radical Functions
Step 2 Use the table to graph the boundary curve. The inequality sign is >, so use a dashed curve and shade the area above it.
Check It Out! Example 6b Continued
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Holt Algebra 2
8-7 Radical Functions
Check Choose a point in the solution region, such as (4, 2), and test it in the inequality.
2 ≥ 1
Check It Out! Example 6b Continued
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Holt Algebra 2
8-7 Radical Functions
Lesson Quiz: Part I
D:{x|x≥ –4}; R:{y|y≥ 0}
1. Graph the function and identify its range and domain.
•
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Holt Algebra 2
8-7 Radical Functions
Lesson Quiz: Part II
g is f reflected across the y-axis and translated 3 units up.
2. Using the graph of as a guide, describe the transformation and graph the function .
•
•
gx = x + 3
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Holt Algebra 2
8-7 Radical Functions
Lesson Quiz: Part III
3. Graph the inequality .