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Earn +20 ptsQ: When will parabola open down?
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In which direction does the parabola?
A parabola can open left, down, right, or left on a graph, if that's what you mean:\
if the parabola open upward a is?
positive.
What equation describes a parabola that opens up or down and whose vertex at the point (hv)?
This is called the 'standard form' for the equation of a parabola:y =a (x-h)2+vDepending on whether the constant a is positive or negative, the parabola will open up or down.
What way does the parabola open if a is greater than 0?
If a is greater than zero then the parabola opens upward.
To find the value of a in a parabola opening up or down subtract the y-value of the parabola at the vertex from the y-value of the point on the parabola that is one unit to the of the vertex?
To find the value of a in a parabola opening up or down subtract the y-value of the parabola at the vertex from the y-value of the point on the parabola that is one unit to the right of the vertex.
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