# Lesson 8

Multiplying Expressions

These materials, when encountered before Algebra 1, Unit 7, Lesson 8 support success in that lesson.

### Lesson Narrative

In this lesson, students use a diagram to multiply factors of the form $$(a+b)(c+d)$$ and gain fluency by using the diagrams in different ways. In the associated Algebra 1 lesson, students factor quadratic expressions of the form $$x^2 - a^2$$. Familiarity with using diagrams to find factors can support students with a more concrete method to approach factoring. Students look for and make use of structure (MP7) when they use diagrams to expand and factor partially filled in diagrams.

### Learning Goals

Teacher Facing

• Recognize that two of the terms from the expanded form of quadratics are opposites.
• Use a diagram to multiply expressions

### Student Facing

• Let’s explore multiplication strategies.

Building Towards