Question 447781
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Hi
h= -0.00635x^2+4.0005x-0.07875
Note: the vertex form of a parabola, {{{y=a(x-h)^2 +k}}} where(h,k) is the vertex
h= -0.00635x^2+4.0005x-0.07875  |Completing the square
h = -.00635[[(x-315)^2 - 99225] -.07875
h = -.00635[(x-315)^2 + 630.07875 -.07875
h = -.00635[(x-315)^2 + 630  Vertex(315,630) a = -.00635 < 0 parabola opens downward
 Maximum height is 630