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D( x )
2*x^3 = 0
2*x^3 = 0
2*x^3 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(10*x^4+50*x^3)/(2*x^3) = 0
10*x^4+50*x^3 = 0
10*x^3*(x+5) = 0
x+5 = 0 // - 5
x = -5
10*x^3*(x+5) = 0
(10*x^3*(x+5))/(2*x^3) = 0
( 10*x^3 )
10*x^3 = 0 // : 10
x^3 = 0
x = 0
( x+5 )
x+5 = 0 // - 5
x = -5
x in { 0}
x = -5
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