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# 2.12: Square Roots and Irrational Numbers

Difficulty Level: Basic Created by: CK-12
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Practice Square Roots and Irrational Numbers

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### Vocabulary Language: English Spanish

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.

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.

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Difficulty Level:
Basic
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