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x in (-oo:+oo)
(1/4)*(600*x-x^3) = 0
1/4*(600*x-x^3) = 0
600*x-x^3 = 0
x*(600-x^2) = 0
-1*x^2 = -600 // : -1
x^2 = 600
x^2 = 600 // ^ 1/2
abs(x) = 10*6^(1/2)
x = 10*6^(1/2) or x = -(10*6^(1/2))
x*(x-10*6^(1/2))*(x+10*6^(1/2)) = 0
1/4*x*(x-10*6^(1/2))*(x+10*6^(1/2)) = 0
( x+10*6^(1/2) )
x+10*6^(1/2) = 0 // - 10*6^(1/2)
x = -(10*6^(1/2))
x = -10*6^(1/2)
( x-10*6^(1/2) )
x-10*6^(1/2) = 0 // + -10*6^(1/2)
x = -(-10*6^(1/2))
x = 10*6^(1/2)
( x )
x = 0
x in { -10*6^(1/2), 10*6^(1/2), 0 }
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