You must have copied something wrong.
N(x) as you have written it will increase with x. There will be no peak.
Are you sure there isn't supposed to be a minus sign in front of 0.4x^2?
Try making a graph to find the answer, once you have verified the correct equation. I recommend you round off N(x) to the nearest integer.
The number of tickets sold each day for an upcoming performance of Handel's messiah is given by N (x) = 0.4x^2 + 11.2x + 12 where x is the number of days since the concert was first announced. when will daily tickets sales peak and how many tickets will be sold that day?
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