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OpenStudy (tylermckinney16):
Help!!!!!!!!! Which of these describes a parabola that opens downward? Explain your reasoning. a. parabola with focus (0, -8) and directrix y=8 b. parabola with focus (0, 8) and directrix y=-8
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OpenStudy (xxbatmanevoxx):
well if it has a maximum it opens downward
Directrix (directrix):
Note that if the directrix is above the focus, then the parabola opens downward. Consider that when choosing the option.
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