1. Algebra 1 Warm up #3
Solve by factoring:

2. 9-5 solve by Completing the square
Objective: To solve a quadratic equation by completing the square.

3. Problem 1

4. Complete the Square Practice
a2 + 2ab + b2
x2 – 6x + ____
x • 2 • ____ = -6x
y2 + 12y + ____
y • 2 • ____ = 12y
n2 + 16n + ____
n • 2 • ____ = 16n
Square root of the first term times 2 times square root of the last term equals the middle term. 9 -3 36 6 64 8

5. Try with a Partner 
Find the value of c that makes each trinomial a perfect square.
x2 – 20x + c
y2 – 3y + c
x2 + x + c
Answers:
100
9/4
1/4

6. Problem 1
Solve by completing the square.

7. Problem 2
Solve by completing the square.

8. Problem 3
Solve by completing the square.

9. Homework
9-5 Worksheet