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Find the zeroes ("roots") of quadratic functions and the vertex of their parabolas. Functions are given in standard, vertex, and factored form.

Learn how to solve quadratic equations, and how to analyze and graph quadratic functions.

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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. …

Opa. Algo deu errado. Por favor, tente novamente. Ah não, parece que ocorreu um erro. Você precisa atualizar. Se o problema persistir, fale conosco.

In this unit, we learn how to solve quadratic equations, and how to analyze and graph quadratic functions.

Ups. Algo salió mal. Por favor inténtalo otra vez. Oh no, parece que encontramos un error. Necesitas actualiza. Si este problema persiste, avísanos.

Explore the quadratic formula proof and review algebraic steps to solve quadratic equations on Khan Academy.

おっと! 何かの間違いが起こりました。もう一度試してみて下さい。 おやまあ，どうやらエラーのようです。 再読み込み する必要があります。もしこの問題が続くようでしたら， 私たちにお伝え下さ …