SOLUTION: how do you know from the equation if a parabola is going to turn left or right?

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Question 308026: how do you know from the equation if a parabola is going to turn left or right?
Answer by texttutoring(324) About Me  (Show Source):
You can put this solution on YOUR website!
What do you mean by turn left or right? Parabolas either open up (if they're positive) or open down (if they're negative).

If you're talking about inverses of parabolas (y=sqrt%28x%29), a positive one will point right, and a negative one will point left.