mgb5e_ppt_8_1 - Chapter 8 Roots and Radicals 8.1...

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Chapter 8 Roots and Radicals
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§ 8.1 Introduction to Radicals
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Martin-Gay, Beginning Algebra, 5ed 3 Square Roots Opposite of squaring a number is taking the square root of a number. A number b is a square root of a number a if b 2 = a. In order to find a square root of a , you need a # that, when squared, equals a.
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Martin-Gay, Beginning Algebra, 5ed 4 The principal ( positive ) square root is noted as a The negative square root is noted as a - Principal Square Roots
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Martin-Gay, Beginning Algebra, 5ed 5 Radical expression is an expression containing a radical sign . Radicand is the expression under a radical sign. Note that if the radicand of a square root is a negative number, the radical is NOT a real number. Radicands
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Martin-Gay, Beginning Algebra, 5ed 6 = 49 7 = 16 25 4 5 = - 4 2 - Radicands Example:
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Martin-Gay, Beginning Algebra, 5ed 7 Square roots of perfect square radicands simplify to rational numbers (numbers that can be written as a quotient of integers). Square roots of numbers that are not perfect
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This note was uploaded on 06/10/2009 for the course MAC 1103 taught by Professor Prescott during the Spring '09 term at Pasco-Hernando Community College.

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mgb5e_ppt_8_1 - Chapter 8 Roots and Radicals 8.1...

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