# Lesson 18

Solving Quadratics

These materials, when encountered before Algebra 1, Unit 7, Lesson 18 support success in that lesson.

### Lesson Narrative

In this lesson, students discuss methods for checking their solutions to a solved equation and focus on the order of the steps to solving a quadratic equation using the quadratic formula. In the associated Algebra 1 lesson, students examine common errors and verify solutions to quadratic equations. The work of this lesson supports students by focusing on a few methods for checking solutions and the order of steps needed to use the quadratic formula. Students have the opportunity to construct viable arguments (MP3) when they explain what steps should be taken to solve and check the solution for a quadratic equation.

### Learning Goals

Teacher Facing

- Determine the order of steps to solve a quadratic equation using the quadratic formula.
- Verify solutions to equations.

### Student Facing

- Let’s work to solve quadratic equations.

### CCSS Standards

Building Towards