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HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Hawkes Learning Systems: Developmental Mathematics Section 14.1: Roots and Radicals

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Perfect Squares and Square Roots Radical Terminology The symbol is called a radical sign. The number under the radical sign is called the radicand. The complete expression, such as is called a radical or radical expression. Square Root If a is a nonnegative real number, then is the principal square root of a, and is the negative square root of a.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Perfect Squares and Square Roots Notes Square roots of negative numbers are not real numbers. For example, is not a real number. There is no real number whose square is  4. Numbers of this type are discussed in Appendices A.8 and A.9.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Evaluating Square Roots o 64 has two square roots, one positive and one negative. The sign is understood to represent the positive square root (or the principal square root) and represents the negative square root. Therefore, we have and o Because we have o Because o is not a real number.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Evaluating Square Roots o Because we know that o because

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Cube Roots If a is a real number, then is the cube root of a. Notes In the cube root expression the number 3 is called the index. In a square root expression such as the index is understood to be 2 and is not written. Expressions with square roots and cube roots (as well as other roots) are called radical expressions.

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Evaluating Cube Roots If a is a real number, then is the cube root of a. Because Note that the cube root of a negative number is a real number and is negative. Because

HAWKES LEARNING SYSTEMS math courseware specialists Copyright © 2011 Hawkes Learning Systems. All rights reserved. Evaluating Radical Expressions with a Calculator