## Completing the Square

**Type:** Mini-lesson

**Theme:** Functions

**Grades:** 9, 10

**Learning Target:** Students will learn how to solve quadratic equations by completing the square graphically and algebraically.

Instructions

- Review quadratic solutions with students: y=x^2+4x-5.
- Ask, "What if you have an irrational solution and don't have a graphing calculator AND forget the quadratic formula?"
- Demonstrate how to complete the square using a graphical method.
- Have students complete the square for:

y=x^2-8x+2

y=x^2+3x-5

### Resources

Exit Ticket

CCSS Math Practice

- I can reason abstractly and quantitatively.

NGSS Crosscutting Concepts