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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-18 = -16/x // + -16/x
x-(-16/x)-18 = 0
x+16*x^-1-18 = 0
1*x^1+16*x^-1-18*x^0 = 0
(1*x^2-18*x^1+16*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-18*x^1+16*x^0) = 0
x^1
x^2-18*x+16 = 0
x^2-18*x+16 = 0
DELTA = (-18)^2-(1*4*16)
DELTA = 260
DELTA > 0
x = (260^(1/2)+18)/(1*2) or x = (18-260^(1/2))/(1*2)
x = (2*65^(1/2)+18)/2 or x = (18-2*65^(1/2))/2
x in { (18-2*65^(1/2))/2, (2*65^(1/2)+18)/2}
x in { (18-2*65^(1/2))/2, (2*65^(1/2)+18)/2 }
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