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X^3-(5*x^2)+16*x-(30/3) = 0
X^3-5*x^2+16*x-10 = 0
X^3-5*x^2+16*x-10 = 0
DELTA = 16^2-(-5*4*(X^3-10))
DELTA = 20*(X^3-10)+256
20*(X^3-10)+256 = 0
20*(X^3-10)+256 = 0
20*X^3+56 = 0
20*X^3+56 = 0
20*X^3 = -56 // : 20
X^3 = -14/5
X^3 = -14/5 // ^ 1/3
X = -(14/5)^(1/3)
DELTA = 0 <=> t_1 = -(14/5)^(1/3)
x = -16/(-5*2) i X = -(14/5)^(1/3)
x = 8/5 i X = -(14/5)^(1/3)
( x = ((20*(X^3-10)+256)^(1/2)-16)/(-5*2) or x = (-(20*(X^3-10)+256)^(1/2)-16)/(-5*2) ) i X > -(14/5)^(1/3)
( x = ((20*(X^3-10)+256)^(1/2)-16)/(-10) or x = ((20*(X^3-10)+256)^(1/2)+16)/10 ) i X > -(14/5)^(1/3)
X+(14/5)^(1/3) > 0
X+(14/5)^(1/3) > 0 // - (14/5)^(1/3)
X > -(14/5)^(1/3)
x in { 8/5, ((20*(X^3-10)+256)^(1/2)-16)/(-10), ((20*(X^3-10)+256)^(1/2)+16)/10 }
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