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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+220/x = 0
4*x^1+220*x^-1 = 0
(4*x^2+220*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2+220*x^0) = 0
x^1
4*x^2+220 = 0
4*x^2+220 = 0
DELTA = 0^2-(4*4*220)
DELTA = -3520
DELTA < 0
x in { }
x belongs to the empty set
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