Algebra 1 Section 9.1 Evaluate square roots Solve simple quadratic equations Note: 5 2 = 25 and (-5) 2 = 25 so both 5 and -5 are square roots of 25. What are the square roots of: If b 2 = a, then b is the square root of a. Table of squares number square

The positive square root of a number is called its principle square root. means the principle square root of a. is the radical sign “a” is the radicand _ + Use a calculator to simplify. Round to the nearest hundredth.

Approximate Evaluate when b = 5, a=3, c=-2 Assign: page 507 problems even

Solve - leave in radical form if necessary. A quadratic equation takes the form: ax 2 + bx + c = 0. It has two solutions. x 2 = 81 3x 2 – 2 = 10

5x = 18 3x = x y = 1

Example 7 page 506

assignment Page 507 Problems 24 – 76 even, 88