SOLUTION: does the following parabola open up or down? How can I tell? Thanks! –3x^2 + 90x

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Question 293256: does the following parabola open up or down? How can I tell? Thanks! –3x^2 + 90x
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
The parabola defined by -3x%5E2%2B90x opens downward.
Note that the coefficient of the first term -3x%5E2 is negative.