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Section 1Chapter 8

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1 Copyright © 2012, 2008, 2004 Pearson Education, Inc. Objectives 2 5 3 4 Radical Expressions and Graphs Find roots of numbers. Find principal roots. Graph functions defined by radical expressions. Find nth roots of nth powers. 8.1

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Find roots of numbers. Objective 1 Slide 8.1- 3

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. The opposite (or inverse) of squaring a number is taking its square root. We now extend our discussion of roots to include cube roots fourth roots and higher roots. Slide 8.1- 4 Find roots of numbers. The nth root of a, written is a number whose nth power equals a. That is,

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. The number a is the radicand. n is the index or order. The expression is the radical. Index Radicand Radical sign Radical Slide 8.1- 5 Find roots of numbers.

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Simplify. Slide 8.1- 6 CLASSROOM EXAMPLE 1 Simplifying Higher Roots Solution:

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Find principal roots. Objective 2 Slide 8.1- 7

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. nth Root Case 1 If n is even and a is positive or 0, then Case 2 If n is even and a is negative, then Case 3 If n is odd, then there is exactly one real nth root of a, written represents the principal nth root of a, represents the negative nth root of a. is not a real number. Slide 8.1- 8 Find principal roots.

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Find each root. Not a real number. Slide 8.1- 9 CLASSROOM EXAMPLE 2 Finding Roots Solution:

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Graph functions defined by radical expressions. Objective 3 Slide 8.1- 10

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Square Root Function The domain and range of the square root function are [0, ). Slide 8.1- 11 Graph functions defined by radical expressions.

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. The domain and range of the cube function are ( , ). Slide 8.1- 12 Graph functions defined by radical expressions. Cube Root Function

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Graph the function by creating a table of values. Give the domain and range. xf(x)f(x) –2 –1 0 2 Domain: [ 2, ) Range: [0, ) Slide 8.1- 13 CLASSROOM EXAMPLE 3 Graphing Functions Defined with Radicals Solution:

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Xf(x)f(x) 0 1 2 33 4 Domain: ( , ) Range: ( , ) Slide 8.1- 14 CLASSROOM EXAMPLE 3 Graphing Functions Defined with Radicals (cont’d) Graph the function by creating a table of values. Give the domain and range. Solution:

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Find nth roots of nth powers. Objective 4 Slide 8.1- 15

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. For any real number a, That is, the principal square root of a 2 is the absolute value of a. Even-Even-Odd Rule – if index is even and radicand is even root, and the answer has an odd power – then you must use absolute value bars! Slide 8.1- 16 Find nth roots of nth powers.

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Find each square root. Slide 8.1- 17 CLASSROOM EXAMPLE 4 Simplifying Square Roots by Using Absolute Value Solution:

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. If n is an even positive integer, then If n is an odd positive integer, then That is, use absolute value when n is even; absolute value is not necessary when n is odd. Slide 8.1- 18 Find nth roots of nth powers.

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Copyright © 2012, 2008, 2004 Pearson Education, Inc. Simplify each root. Slide 8.1- 19 CLASSROOM EXAMPLE 5 Simplifying Higher Roots by Using Absolute Value Solution:

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