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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/4-((1/2)*x) = 4/x // - 4/x
9/4-((1/2)*x)-(4/x) = 0
(-1/2)*x-4*x^-1+9/4 = 0
9/4*x^0-1/2*x^1-4*x^-1 = 0
(9/4*x^1-1/2*x^2-4*x^0)/(x^1) = 0 // * x^2
x^1*(9/4*x^1-1/2*x^2-4*x^0) = 0
x^1
(-1/2)*x^2+(9/4)*x-4 = 0
(-1/2)*x^2+(9/4)*x-4 = 0
DELTA = (9/4)^2-(-4*4*(-1/2))
DELTA = -47/16
DELTA < 0
x in { }
x belongs to the empty set
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