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D( a )
a+2 = 0
a+2 = 0
a+2 = 0
a+2 = 0 // - 2
a = -2
a in (-oo:-2) U (-2:+oo)
(a^2+4*a+32)/(a+2) = 0
a^2+4*a+32 = 0
a^2+4*a+32 = 0
DELTA = 4^2-(1*4*32)
DELTA = -112
DELTA < 0
1 = 0
1/(a+2) = 0
a belongs to the empty set
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