Solving Quadratic Equations Using Square Roots - Problem 4 888 views
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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