# Alg1.7 Quadratic Equations

In this unit, students interpret, write, and solve quadratic equations. They learn that writing and solving quadratic equations is a way to precisely describe and answer questions about quadratic functions. It is especially useful for finding input values that produce certain outputs.

Students solve quadratic equations by reasoning, by rewriting expressions in factored form and using the zero product property, by completing the square, and by applying the quadratic formula. They also rewrite expressions in vertex form to solve problems about the maximum or minimum value of a function. Along the way, students see that quadratic equations may have 2, 1, or 0 solutions, and that the solutions may be rational or irrational.

### Lessons

#### Finding Unknown Inputs

#### Solving Quadratic Equations

- 3Solving Quadratic Equations by Reasoning
- 4Solving Quadratic Equations with the Zero Product Property
- 5How Many Solutions?
- 6Rewriting Quadratic Expressions in Factored Form (Part 1)
- 7Rewriting Quadratic Expressions in Factored Form (Part 2)
- 8Rewriting Quadratic Expressions in Factored Form (Part 3)
- 9Solving Quadratic Equations by Using Factored Form
- 10Rewriting Quadratic Expressions in Factored Form (Part 4)