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Aim: How Do We Simplify Radicals?

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. The entire expression, including the radical sign and radicand, is called the radical expression. radicand. radical sign. Definitions square root Finding the square root of a given number is the reverse process of squaring a number.

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Definitions The index tells the “root” of the expression. Since square roots have an index of 2, the index is generally not written in a square root. Example:

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Definitions Square roots of negative numbers are not real numbers. Square roots of negative numbers are called imaginary numbers. There is no number multiplied by itself that will give you –25. (Imaginary numbers will be studied later)

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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 rational number is one that can be written in the form, where a and b are integers, and b 0. Real numbers that are not rational numbers are called irrational numbers. As decimals, irrational numbers are nonrepeating, nonterminating decimals.

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Perfect Squares 1 64 225 625 4 81 256 9100 289 16 121 324 25 144 400 36 169 49 196

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= = = = = = = = = = Perfect Square Factor * Other Factor LEAVE IN RADICAL FORM

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= = = = = = = = = = Perfect Square Factor * Other Factor LEAVE IN RADICAL FORM

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= = = = = = = = = = Perfect Square Factor * Other Factor LEAVE IN RADICAL FORM

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Cube and Fourth Roots is read “the cube root of a.”is read “the fourth root of a.”

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= X = Y 3 = P 2 X 3 Y = 2X 2 Y = 5C 4 D 5

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= = = =

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= = = =

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