1. 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: 36 121.09 If b 2 = a, then b is the square root of a. Table of squares number square 1 1 2 4 3 9 4 16 5 25 6 36 7 49 8 64 9 81 10 100 11 121 12 144

2. 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.

3. Approximate Evaluate when b = 5, a=3, c=-2 Assign: page 507 problems 24-52 even

4. 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

5. 5x 2 + 3 = 18 3x 2 + 2 = x 2 + 8 6y 2 + 13 = 1

6. Example 7 page 506

7. assignment Page 507 Problems 24 – 76 even, 88