# 2.9: Square Roots and Irrational Numbers

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approximate solution

An approximate solution to a problem is a solution that has been rounded to a limited number of digits.Irrational Number

An irrational number is a number that can not be expressed exactly as the quotient of two integers.Perfect Square

A perfect square is a number whose square root is an integer.principal square root

The principal square root is the positive square root of a number, to distinguish it from the negative value. 3 is the principal square root of 9; -3 is also a square root of 9, but it is not principal square root.rational number

A rational number is a number that can be expressed as the quotient of two integers, with the denominator not equal to zero.Square Root

The square root of a term is a value that must be multiplied by itself to equal the specified term. The square root of 9 is 3, since 3 * 3 = 9.### Image Attributions

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Find the principal square root of numbers and simplify square root problems.

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Date Created:

Aug 13, 2012
Last Modified:

Jul 01, 2016
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