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In f(x) = a(x - p)(x - 9), what does "a" tell us?​

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Answer:

Step-by-step explanation:

f(x) = a(x-p)(x-9) is the equation of a vertical  parabola.

If a>0, the parabola opens upwards.

If a<0, the parabola opens downwards.

Also, the focal length of the parabola is 1/|4a|.

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