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Sections 11.1: Square Roots & 11.2: Approximating Square Roots Pg.533, 540

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Objectives & Vocabulary 1.Evaluate expressions using square roots (11.1). 2.Approximate square roots of numbers (11.2). Square root (pg.533): of a number n, the square root is the number m which, when multiplied by itself, equals n. Perfect square (pg.533): numbers that are squares of integers [ex: 4 and 25 are perfect squares]. Radical expression (pg.534): an expression involving a radical sign (or square root). Irrational number (pg.541): cannot be written as a quotient of two integers, and the decimal form of an irrational number neither terminates nor repeats [ex: the square root of 11]. Real number (pg.541): all rational and irrational numbers (any number is a real number).

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Example 1: Finding Square Roots A.Find the square root of 81. B.Find the square root of 49.

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Example 2: Evaluating Square Roots

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Example 3: Evaluating Radical Expressions

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Example 4: Solving Equations Using Square Roots

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Example 5: Approximating Square Roots

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Homework Time—yea! Pg.535(2-22E) & pg.542-543(2-20E, no10)

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Perfect squares: 1, 4, 9, __, __, __, __, __, __, __,… 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2.

Perfect squares: 1, 4, 9, __, __, __, __, __, __, __,… 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2.

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