The mechanics of using the quadratic formula are clearly detailed in this example-full presentation, along with how to identify and walk through the algorithm. Step-by-step attack methods are provided with examples of several different leading coefficients and signs worked. An emphasis is placed on interpretation of answers as decimals, rather than abstract radical notation, along with appropriate and effective calculator use.

Concepts

quadratic equations, quadratic formula, discriminant

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Additional Tags

math

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Instructional Ideas

• Consider linking to the video on the class website for viewing prior to class or for homework help 
• Use as an extended bellringer problem set after teaching the quadratic formula
• Leave as a short substitute lesson plan with a corresponding problem set from your curriculum

Classroom Considerations

• Video access requires Internet availability
• Formula answers are not simplified into radical form but instead plugged into a calculator for decimal approximation
• Consider pausing the video at each problem to allow time for seatwork and questions

Pros

• Clear and easily understood narration
• No assumptions made that the learner has seen the quadratic formula or is familiar with the terminology
• Structure from the beginning includes the discriminant as a feature, leading to later and higher level lessons

Cons

• Approximate answers given with exact equals signs
• No provision of independent work problems
• No printable note slides made available

Common Core

HSA-REI.B.4.a HSA-REI.B.4.b