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.
CCSS Standards
Building Towards
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