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36*x-((9/2)*x^2) = 0
(-9/2)*x^2+36*x = 0
36*x-9/2*x^2 = 0
DELTA = 36^2-(-9/2*0*4)
DELTA = 1296
DELTA > 0
x = (1296^(1/2)-36)/(-9/2*2) or x = (-1296^(1/2)-36)/(-9/2*2)
x = 0 or x = 8
x in { 0, 8 }
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