Upcoming SlideShare
×

# April 7, 2014

736 views

Published on

Published in: Technology, Education
0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

• Be the first to like this

Views
Total views
736
On SlideShare
0
From Embeds
0
Number of Embeds
516
Actions
Shares
0
3
0
Likes
0
Embeds 0
No embeds

No notes for slide

### April 7, 2014

1. 1. Today: Review all Quadratics for Test Friday New Solving & Graphing Method: Square Roots Complete Class Work from Friday
2. 2. 3rd Quarter Final Exam: The exam is on Friday; be here. 10 Questions on: A. Quadratics B. Factoring ax2 + bx + c polynomials 10 Questions on: C. Exponents D. Adding, Subtracting, Multiplying & Dividing Monomials and Polynomials Notebooks submitted Tues – Fri. (1st – 4th)
3. 3. Warm-Up/Review: 1. y = 5x2 – 1; Graph the general shape and location from the information given in the function. Width, shape, vertex, y-intercept, etc. Even the missing ‘b’ term provides information.
4. 4. Warm-Up/Review: Find the axis of symmetry for the graph y = 3x2 + 6x + 4 a. y = -1 b. x = 1 c. x = -1 d. y = 1 A graph of a quadratic function has x intercepts of (3,0) and (-7,0). Which of the following could match the graph? a. x2 + 4x - 21 = 0 b. x2 - 10x - 21 = 0 c. x2 + 10x + 21 = 0 d. x2 - 4x + 21 = 0
5. 5. Warm-Up/Review:
6. 6. Warm-Up/Review:
7. 7. Warm-Up/Review:(3)
8. 8. Warm-Up/Review: Why or why not? Why or why not?
9. 9. Warm-Up/Review:
10. 10. Holt Algebra 1 9-3 Graphing Quadratic Functions Write down the steps, in order, that you would follow to solve the equation y + 6x = x2 + 9 Step 2: The axis of symmetry is x = 3. = 3 y = x2 – 6x + 9Rewrite in standard form.Step 1 Find the axis of symmetry.
11. 11. Holt Algebra 1 9-3 Graphing Quadratic Functions Step 3: = 9 – 18 + 9 = 0 The vertex is (3, 0). The y-coordinate is 0. . y = x2 – 6x + 9 y = 32 – 6(3) + 9 Find the vertex.
12. 12. Holt Algebra 1 9-3 Graphing Quadratic Functions Step 4: y = x2 – 6x + 9 y = x2 – 6x + 9 The y-intercept is 9; the graph passes through (0, 9). Identify c. Find the y-intercept.
13. 13. Holt Algebra 1 9-3 Graphing Quadratic Functions Step 5: Since the axis of symmetry is x = 3, choose x-values less than 3. Let x = 2 y = 1(2)2 – 6(2) + 9 = 4 – 12 + 9 = 1 Let x = 1 y = 1(1)2 – 6(1) + 9 = 1 – 6 + 9 = 4 Two other points are (2, 1) and (1, 4). Find two more points on the same side of the axis of symmetry as the point containing the y- intercept.
14. 14. Holt Algebra 1 9-3 Graphing Quadratic Functions Step 6: Reflect the points across the axis of symmetry. Connect the points with a smooth curve. y = x2 – 6x + 9 x = 3 (3, 0) (0, 9) (2, 1) (1, 4) (0, 9) (1, 4) (2, 1) x = 3 (3, 0) Graph the axis of symmetry, the vertex, the point containing the y-intercept, and two other points. Step 7: