SOLUTION: How do you tell which way a parabola will open by their equation?

Question 263410: How do you tell which way a parabola will open by their equation?
Answer by drk(1908) (Show Source): You can put this solution on YOUR website!
The general parabola formula is

in either case to determine up or down, look at the "a" value
If "a' is positive, then it opens up
if "a" is negative, then it opens down
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