Use an understanding of equality to find solutions of quadratics graphically. A well-designed lesson illustrates the relationship between the right and left sides of an equation graphically. With one side quadratic and the other side linear, the solutions to the equation lie on the intersection of the parabola and line.

Concepts

quadratic equations, solving quadratics, solving systems by graphing, intersection

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Additional Tags

math

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Instructional Ideas

• Demonstrate how to use the method to solve linear, or other types of equations, as well
• Have pupils create an equation for a partner to solve

Classroom Considerations

• Requires a strong understanding of graphing quadratic functions

Pros

• Uses color to emphasize important concepts
• Offers several examples that show both integer and decimal answers

Cons

• None

Common Core

SL.8.2 SL.9-10.2 SL.11-12.2 RST.6-8.7 RST.9-10.7 RST.11-12.7