1. Section 9.5 Quadratic Formula – Round 2 Goal: Use the quadratic formula to solve quadratic equations and to find the x-intercepts. Knocking out math problems one by one!

2. Algebra 1(B) Daily Warm Up Sketch a graph of the function. y = -3x² + 6x + 2 1.Does graph open up or down? 2.Give coordinates of the vertex. 3.Write the of the axis of symmetry. down (1, -5) x = 1

3. From yesterday’s lesson … Step 1: Step 2: Step 3: Step 4: The “ “ Formula

4. Homework Questions?

5. Connections Section 9.4Section 9.5 Solve by using the quadratic formula: Represent the solution graphically:

6. So … What Have We Learned? The quadratic formula allows us to find the solutions to a quadratic equation AND these are also the x-intercepts.

7. Step-by-Step Guide How do we find the x-intercepts of y = x² + 3x – 8? Step 1: Write in standard form. x² + 3x – 8 = 0 Step 2: Identify a, b, c. a = 1, b = 3, c = -8 Step 3: Plug into quadratic formula. ≈ 1.70,≈ -4.70

8. K ENTUCKY D ERBY You will be split into groups of 4. Each member of the group is responsible for showing his/her own work. A letter will be assigned to each person in the group. Letters will be called randomly. That person will have to show a teacher his/her answer. Your horse will advance to the next square if you are correct. The first horse to cross the finish line is the winner. Directions

9. K ENTUCKY D ERBY Problem 1 Start Finish x = 1, x = -7

10. K ENTUCKY D ERBY Problem 2 Start Finish x = 8, x = -2

11. K ENTUCKY D ERBY Problem 3 Start Finish x = 1.5, x = 2

12. K ENTUCKY D ERBY Problem 4 Start Finish x = -0.6, x = -1

13. K ENTUCKY D ERBY Problem 5 Start Finish x = 0.47, x = -6.47

14. Homework pgs. 536-537 #44-46, 53-55 Quiz 9.4-9.6 on Monday 4/6!