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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)
(45*x^2-290400)/(x^2) = 0
45*x^2 = 290400 // : 45
x^2 = 19360/3
x^2 = 19360/3 // ^ 1/2
abs(x) = (19360/3)^(1/2)
x = (19360/3)^(1/2) or x = -(19360/3)^(1/2)
x in { (19360/3)^(1/2), -(19360/3)^(1/2) }
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