Question 253584
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Since you have a 2nd degree function with a negative lead coefficient, the graph will be a parabola opening down.  The horizontal coordinate of the vertex of the parabola is the input value that gives the maximum function value.  The horizontal coordinate of a parabola is found by dividing the additive inverse of the 1st degree term coefficient by two times the lead coefficient, which is to say *[tex \Large \frac{-b}{2a}], or in your case *[tex \Large \frac{-9}{2(-0.1)}].  You can do your own arithmetic.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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