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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(2*x^2+10*x+16)/(x+2) = 0
2*x^2+10*x+16 = 0
2*(x^2+5*x+8) = 0
x^2+5*x+8 = 0
DELTA = 5^2-(1*4*8)
DELTA = -7
DELTA < 0
2 = 0
2/(x+2) = 0
x belongs to the empty set
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