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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^2-20800)/(x^2) = 0
3*x^2 = 20800 // : 3
x^2 = 20800/3
x^2 = 20800/3 // ^ 1/2
abs(x) = (20800/3)^(1/2)
x = (20800/3)^(1/2) or x = -(20800/3)^(1/2)
x in { (20800/3)^(1/2), -(20800/3)^(1/2) }
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