2 Objective 1: Find principal square roots of numbers A square root of a number a is a number c such thatExamples:25 has a square root of 5 because25 has a square root of -5 because-16 does not have a real-number square root because there is no real number c such that
3 Theorem 7-1-Every positive real number has two real-number square roots. -The number 0 has just one square root, 0 itself. -Negative numbers do not have real-number square roots. Ex. Find the two square roots of 64. The square roots are 8 and -8.
4 Try ThisFind the square roots of each number.936121-49
5 DefinitionThe principal square root of a nonnegative number is its nonnegative square root. The symbol represents the principal square root of a. the negative square root of a is written . Ex. Simplify