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