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48*x-((9/2)*x^2) = 0
(-9/2)*x^2+48*x = 0
48*x-9/2*x^2 = 0
DELTA = 48^2-(-9/2*0*4)
DELTA = 2304
DELTA > 0
x = (2304^(1/2)-48)/(-9/2*2) or x = (-2304^(1/2)-48)/(-9/2*2)
x = 0 or x = 32/3
x in { 0, 32/3 }
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