SOLUTION: For f(x)=ax^2+bx+c, how can we tell if the parabola open up or opens down

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Question 705303: For f(x)=ax^2+bx+c, how can we tell if the parabola open up or opens down
Answer by jsmallt9(3758) About Me  (Show Source):
You can put this solution on YOUR website!
If the "a" is positive then the parabola opens upward. If the "a" is negative then the parabola opens downward. (If "a" = 0 then the function is not a parabola.)