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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/9 = a+17/a // - a+17/a
2/9-a-(17/a) = 0
2/9-a-17*a^-1 = 0
2/9*a^0-1*a^1-17*a^-1 = 0
(2/9*a^1-1*a^2-17*a^0)/(a^1) = 0 // * a^2
a^1*(2/9*a^1-1*a^2-17*a^0) = 0
a^1
(2/9)*a-a^2-17 = 0
(2/9)*a-a^2-17 = 0
DELTA = (2/9)^2-(-17*(-1)*4)
DELTA = -5504/81
DELTA < 0
a in { }
a belongs to the empty set
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