SOLUTION: suppose you have the quadratic equation of tickets=-0.2x(squared)+ 12x+11 ; x=1 day ticket sales start. does the graph of this equation open up or down? how do you know

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Question 411096: suppose you have the quadratic equation of
tickets=-0.2x(squared)+ 12x+11 ; x=1 day ticket sales start.
does the graph of this equation open up or down? how do you know
Answer by josmiceli(9817) About Me  (Show Source):
You can put this solution on YOUR website!
The graph opens down, in other words,
it has a maximum, and not a minimum.
Suppose you had y+=+-x%5E2+%2B+10,
The peak is at y+=+10, and any value (+ or -)
of x other than 0 will make y
less than the peak.