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Completing the square or using the quadratic formula and discriminant are useful when working with quadratic equations. The following is an introduction that includes steps, formulas, and examples. Also, a geometric approach to completing the square is illustrated.
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Lessons, practice, and teacher resource from Regents Exam Prep Center|Complete the square & Algebra tiles | Quadratic Formula and discriminant
Notes and examples from Algebralab.org | Completing the square, finding vertex of a parabola
Here are some helpful math videos from yaymath.org
<--- Practice quiz
Completing the Square Basic Steps
1) Isolate the variables
1a) Change the lead coefficient to 1
2) Complete the square
3) Factor the trinomial
4) Simplify or solve
"Friends don't let friends dErive drunk" (click lower right to view)
Math humor in Gate C