Pre-Calculus: 1001 Practice Problems For Dummies (+ Free Online Practice)
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Quadratic equations are written in many different formats, depending on what the current application is. Completing the square is helpful when you’re writing conics in their standard form, and you can use this method to solve for the solutions of a quadratic equation. Here’s how to solve for x in the quadratic equations ax2 + bx + c = 0 and 2x2 +7x ‒ 15 = 0 by completing the square:

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Mary Jane Sterling is the author of numerous For Dummies books. She has been teaching at Bradley University in Peoria, Illinois, for more than 25 years.

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