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