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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-x-(5/4)-4 = 0
2/x-x-5/4-4 = 0
2*x^-1-1*x^1-21/4*x^0 = 0
(2*x^0-1*x^2-21/4*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1*x^2-21/4*x^1) = 0
x^1
(-21/4)*x-x^2+2 = 0
(-21/4)*x-x^2+2 = 0
DELTA = (-21/4)^2-(-1*2*4)
DELTA = 569/16
DELTA > 0
x = ((569/16)^(1/2)-(-21/4))/(-1*2) or x = (-(-21/4)-(569/16)^(1/2))/(-1*2)
x = ((569/16)^(1/2)+21/4)/(-2) or x = (21/4-(569/16)^(1/2))/(-2)
x in { ((569/16)^(1/2)+21/4)/(-2), (21/4-(569/16)^(1/2))/(-2)}
x in { ((569/16)^(1/2)+21/4)/(-2), (21/4-(569/16)^(1/2))/(-2) }
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