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# Roots of real numbers and radical expressions

## by Jessica Garcia on Nov 28, 2010

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## Roots of real numbers and radical expressionsPresentation Transcript

• 5.5 Roots of Real Numbers and Radical Expressions
• Definition of n th Root ** For a square root the value of n is 2. For any real numbers a and b and any positive integers n , if an = b , then a is the n th root of b .
• Definitions A perfect square is the square of a natural number. 1, 4, 9, 16, 25, and 36 are the first six perfect squares. A perfect cube is the cube of a natural number. 1, 8, 27, 64, 125, and 216 are the first six perfect cubes.
• Notation Note: An index of 2 is understood but not written in a square root sign. index radical radicand