Скачать или смотреть Number of Solutions (x²) — learn the discriminant for the hard SAT Math module

Every SAT will ask you or tell you the number of solutions for a quadratic equation with an x² term. You can sometimes graph the equations to see the solutions and intersections for yourself, but the hardest questions will make graphing difficult. The discriminant is a key formula that you must memorize if you want a top score. This lesson shows you how it works with several examples. But if you’re asked for the number of solutions and there is no x² term, then the question is probably much easier, and the process is covered in this lesson:
   • Number of Solutions (no x²) — solve this c...  

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