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(x^4)/3-(2*x^3)-(5*x^2) = 0
(x^4)/3-2*x^3-5*x^2 = 0
1/3*x^4-2*x^3-5*x^2 = 0
x^2*(1/3*x^2-2*x-5) = 0
1/3*x^2-2*x-5 = 0
DELTA = (-2)^2-(-5*1/3*4)
DELTA = 32/3
DELTA > 0
x = ((32/3)^(1/2)+2)/(1/3*2) or x = (2-(32/3)^(1/2))/(1/3*2)
x = 3/2*((32/3)^(1/2)+2) or x = 3/2*(2-(32/3)^(1/2))
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 3/2*(2-(32/3)^(1/2)), 3/2*((32/3)^(1/2)+2), 0 }
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