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32*(-1/2)*x^2+2000*x+0 = 40000 // - 40000
32*(-1/2)*x^2+2000*x-40000+0 = 0
32*(-1/2)*x^2+2000*x-40000 = 0
2000*x-16*x^2-40000 = 0
DELTA = 2000^2-(-40000*(-16)*4)
DELTA = 1440000
DELTA > 0
x = (1440000^(1/2)-2000)/(-16*2) or x = (-1440000^(1/2)-2000)/(-16*2)
x = 25 or x = 100
x in { 25, 100 }
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