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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-x-(7*x)-13/2+2 = 0
1/x-x-7*x-13/2+2 = 0
1*x^-1-8*x^1-9/2*x^0 = 0
(1*x^0-8*x^2-9/2*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-8*x^2-9/2*x^1) = 0
x^1
(-9/2)*x-8*x^2+1 = 0
(-9/2)*x-8*x^2+1 = 0
DELTA = (-9/2)^2-(-8*1*4)
DELTA = 209/4
DELTA > 0
x = ((209/4)^(1/2)-(-9/2))/(-8*2) or x = (-(-9/2)-(209/4)^(1/2))/(-8*2)
x = ((209/4)^(1/2)+9/2)/(-16) or x = (9/2-(209/4)^(1/2))/(-16)
x in { ((209/4)^(1/2)+9/2)/(-16), (9/2-(209/4)^(1/2))/(-16)}
x in { ((209/4)^(1/2)+9/2)/(-16), (9/2-(209/4)^(1/2))/(-16) }
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