Question 1194085
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The roots of this quadratic function are  {{{300 +- 5*sqrt(3601)}}},

or  -0.042  and  600.042, approximately.



So, the domain of the function (the area, where it is meaningful) is this interval  [0,600.042].



The function is a downward parabola with the maximum at " {{{-b/(2a)}}} " = {{{(-600)/(2*(-1))}}} = 300.



So, over the interval  [0,300)  the function is increasing;  over the interval  (300,600.042]  it is decreasing.    <U>ANSWER</U>
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Solved.