How do you determine if a parabola opens up or down?│Quadratic Function 

This math tutorial explains how to determine whether a parabola opens upward or downward for a quadratic function given in standard form, vertex form and factored form. Whether a quadratic equation is given in standard form, vertex form or factored form: If A is greater than zero, the parabola opens upward. If A is less than zero, the parabola opens downward.
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