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D( x )
x^3+5*x^2+6*x = 0
x^3+5*x^2+6*x = 0
x^3+5*x^2+6*x = 0
x^3+5*x^2+6*x = 0
x*(x^2+5*x+6) = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
x = 0
x = 0
x in (-oo:-3) U (-3:-2) U (-2:0) U (0:+oo)
(3*x+8)/(x^3+5*x^2+6*x) = 0
x^3+5*x^2+6*x = 0
x*(x^2+5*x+6) = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
x*(x+3)*(x+2) = 0
(3*x+8)/(x*(x+3)*(x+2)) = 0
3*x+8 = 0 // - 8
3*x = -8 // : 3
x = -8/3
x = -8/3
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