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