The quadratic formula is what works—always. Instruct your classes on the application of the quadratic formula using a thorough video lesson followed by provided practice problems. The lesson connects algebraic solutions to graphical solution while teaching individuals how to apply the quadratic formula to quadratic equations with all types of solutions.

Concepts

quadratic formula, solving quadratics, quadratic equations, complex numbers, imaginary numbers

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Instructional Ideas

• Have individuals in a group each solve the quadratic equations in the practice set using a different method (e.g., factor, quadratic formula, graph, etc.) and compare results

Classroom Considerations

• Third lesson in a four-part complex numbers series
• Expects familiarity with the quadratic formula prior to the lesson

• This video is hosted on YouTube

Pros

• Emphasizes the difference between approximate and exact solutions
• Highlights common mistakes and misconceptions throughout the lesson presentation

Cons

• None

Common Core

RI.11-12.7 SL.11-12.2 HSN-CN.C.7 HSA-REI.B.4.a HSA-REI.B.4.b