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D( x )
x^3+125 = 0
x+5 = 0
x^3+125 = 0
x^3+125 = 0
1*x^3 = -125 // : 1
x^3 = -125
x^3 = -125 // ^ 1/3
x = -5
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
((x^2+10*x+25)/(x^3+125))*(2/(x+5)) = 0
(2*(x^2+10*x+25))/((x^3+125)*(x+5)) = 0
x^2+10*x+25 = 0
x^2+10*x+25 = 0
DELTA = 10^2-(1*4*25)
DELTA = 0
x = -10/(1*2)
x = -5 or x = -5
(x+5)^2 = 0
(2*(x+5))/(x^3+125) = 0
x+5 = 0 // - 5
x = -5
x in { -5}
x belongs to the empty set
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