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Learn how to use the quadratic formula to solve quadratic equations with step-by-step guidance.
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Learn and practice quadratic functions and equations with Khan Academy's comprehensive resources.
Learn how to solve quadratic equations by factoring with Khan Academy's step-by-step guide.
Want to know the path a soccer ball will take through the air? We need quadratic equations. Some equation-solving strategies, like taking the square root or factoring, work best with friendly numbers. Others, like completing the square, work with any kind of numbers. Which will you choose?
Solve quadratic equations using the quadratic formula. For example, solve -9x+10x²+8=14.
Solving quadratic equations | Lesson. Solving quadratic equations — Basic example. Solving quadratic equations — Harder example. Solving quadratic equations: medium.
Learn how you can find the range of any quadratic function from its vertex form.
Learn to factor expressions that have powers of 2 in them and solve quadratic equations. We'll also learn to manipulate more general polynomial expressions. Skip to main content
Worked example: completing the square (leading coefficient ≠ 1) Solving quadratics by completing the square: no solution. Proof of the quadratic formula. Solving quadratics by completing the square. Completing the square review. Quadratic formula proof review.