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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-600/x = (-0.3*x^2)/2 // - (-0.3*x^2)/2
-((-0.3*x^2)/2)-600/x = 0
0.15*x^2-600/x = 0
0.15*x^2-600*x^-1 = 0
x^-1*(0.15*x^3-600) = 0
0.15*x^3 = 600 // : 0.15
x^3 = 4000
x^3 = 4000 // ^ 1/3
x = 10*4^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = 10*4^(1/3)
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