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Using the Quadratic Formula

Videos to help Algebra I students learn how to use the quadratic formula to solve quadratic equations that cannot be easily factored.
Students understand that the discriminant, b2 - 4ac, , can be used to determine whether a quadratic equation has one, two, or no real solutions.

New York State Common Core Math Module 4, Algebra I, Lesson 15

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Lesson 15 Summary

You can use the sign of the discriminant, b2 - 4ac, to determine the number of real solutions to a quadratic equation in the form ax2 + bx + c = 0, where a ≠ 0. , where . If the equation has a positive discriminant, there are two real solutions. A negative discriminant yields no real solutions and a discriminant equal to zero yields only one real solution.

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