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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-x+5/2-2 = 0
4*x^-1-1*x^1+1/2*x^0 = 0
(1/2*x^1-1*x^2+4*x^0)/(x^1) = 0 // * x^2
x^1*(1/2*x^1-1*x^2+4*x^0) = 0
x^1
(1/2)*x-x^2+4 = 0
(1/2)*x-x^2+4 = 0
DELTA = (1/2)^2-(-1*4*4)
DELTA = 65/4
DELTA > 0
x = ((65/4)^(1/2)-(1/2))/(-1*2) or x = (-(1/2)-(65/4)^(1/2))/(-1*2)
x = ((65/4)^(1/2)-1/2)/(-2) or x = ((65/4)^(1/2)+1/2)/2
x in { ((65/4)^(1/2)-1/2)/(-2), ((65/4)^(1/2)+1/2)/2}
x in { ((65/4)^(1/2)-1/2)/(-2), ((65/4)^(1/2)+1/2)/2 }
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