Here is a site that clearly and thoroughly explains how to solve quadratic equations by completing the square. The quadratic formula is derived using this method on this page. Point this site out to students who have been absent or who need additional instruction on this or many other topics.

Concepts

completing the square

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Additional Tags

quadratic formula derivation, topics in precalculus: completing the square, perfect square trinomial, quadratic function

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Classroom Considerations

• Knovation Readability Score: 2 (1 low difficulty, 5 high difficulty)

Common Core

HSA-SSE.B.3.b HSF-IF.C.8.a HSA-REI.B.4.a HSA-REI.B.4.b