Lesson 1: Introduction to Quadratic Expressions

• What is a quadratic expression?
• Why do we call it "quadratic"?
• What does the squared term mean?
• How are quadratic expressions different from linear ones?

Quadratic, squared, exponent, term, coefficient, variable

CCSS.MATH.8.EE.A.1, CCSS.MATH.9.A.SSE.A.1

Description: Students are introduced to quadratic expressions (expressions with a squared variable, like x²). Using area models (squares and rectangles), they see why it's called "quadratic" (quad = 4 sides, relating to area). They identify quadratic expressions among linear and other types. Purpose: To establish foundational understanding of quadratic expressions and how they differ from linear. DOK Level: 1-2 (Recall and Understanding)

• Concrete visual: Use actual squares and rectangles to show x²
• For struggling learners: Focus on identifying quadratics in standard form (ax² + bx + c)
• For advanced learners: Include expressions in different forms
• Color-coding: Highlight the x² term in different colors

• Observation: Can students identify quadratic expressions?

• Sorting activity: Classify expressions as linear, quadratic, or other

• Worksheet: Identify the quadratic term and other parts

• Exit ticket: Explain what makes an expression quadratic

• Area model tiles or diagrams

• Expression cards (linear and quadratic)

• Sorting worksheet

• Anchor chart showing quadratic form

• Resource: Khan Academy "Quadratic Expressions" (adapted)