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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)
(2100-(2*x))/(x^2) = 0
(2100-2*x)/(x^2) = 0
2100-2*x = 0 // - 2100
-2*x = -2100 // : -2
x = -2100/(-2)
x = 1050
x = 1050
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