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Solving Quadratic Equations Using Square Roots - Problem 4

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Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Often, when students see a binomial squared, they can't help but expand it. If you are presented with a quadratic equation with a squared binomial, you could technically expand, combine like terms, write it in standard form, and re-factor to solve it BUT there is an easier way: we isolate the squared binomial, square root both sides, being sure the include a positive and negative square root, and then solve for x. This solving method is often used after completing the square or if you are given a parabolic function in vertex form and you want to find the x-intercepts.

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