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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/8 = 9/(2*x) // - 9/(2*x)
(3*x)/8-(9/(2*x)) = 0
(3*x)/8+(-9/2)*x^-1 = 0
3/8*x^1-9/2*x^-1 = 0
(3/8*x^2-9/2*x^0)/(x^1) = 0 // * x^2
x^1*(3/8*x^2-9/2*x^0) = 0
x^1
(3/8)*x^2-9/2 = 0
(3/8)*x^2-9/2 = 0
DELTA = 0^2-(4*(3/8)*(-9/2))
DELTA = 27/4
DELTA > 0
x = ((27/4)^(1/2)+0)/(2*(3/8)) or x = (0-(27/4)^(1/2))/(2*(3/8))
x = 4/3*(27/4)^(1/2) or x = 4/3*(27/4)^(1/2)
x in { 4/3*(27/4)^(1/2), 4/3*(27/4)^(1/2)}
x in { 4/3*(27/4)^(1/2), 4/3*(27/4)^(1/2) }
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