1. 2-4 completing the square
Chapter 2
2-4 completing the square

4. objectives *Solve quadratic equations by using the square property
* Solve quadratic equations by completing the square.

5. Square root property
Many quadratic equations contain expressions that cannot be easily factored. For equations containing these types of expressions, you can use square roots to find roots.

6. Examples using the square root property
Example #1 Solve the equation. 4 𝑥 2 +11=59 Solution: 4 𝑥 2 +11=59 solve for x −11 −11 4 𝑥 2 =48 4 𝑥 2 4 = 48 4 𝑥 2 =12 𝑥= 12

7. Example #2
Solve the equation.
x2 + 12x + 36 = 28

8. Student Guided Practice
Solve the following equations
1. 4x2 – 20 = 5
2. x2 + 8x + 16 = 49

9. Completing the square What is completing the square? Answer:
If a quadratic expression of the form x2 + bx cannot model a square, you can add a term to form a perfect square trinomial. This is called completing the square.

10. Completing the square

11. Completing the square steps

12. Example #3
Solve the equation by completing the square.
x2 = 12x – 20

13. Example#4
Solve the equation by completing the square
18x + 3x2 = 45

14. Example #5 Solve each equation by completing the square.
1) problem #1 in completing the square worksheet
p2 + 14p − 38 = 0

15. Student guided practice
Do problems from worksheet 2-6 and

16. Writing quadratic functions in vertex form
Recall the vertex form of a quadratic function from lesson: f(x) = a(x – h)2 + k, where the vertex is (h, k).
You can complete the square to rewrite any quadratic function in vertex form.

17. Example #6 Write the function in vertex form, and identify its vertex.
f(x) = x2 + 16x – 12

18. Example#7 Write the function in vertex form, and identify its vertex
g(x) = 3x2 – 18x + 7

19. Student guided practice
Write the function in vertex form, and identify its vertex
g(x) = 3x2 – 18x + 7

20. homework
Do problems 26 through 36
From page 89

21. Closure
Today we learn about solving a quadratic equation using completing the square.
Next class we are going to learn about complex numbers and roots