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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
76 = 100*(53.8/x)^2 // - 100*(53.8/x)^2
76-(100*(53.8/x)^2) = 0
76-100*(53.8/x)^2 = 0
-100*53.8^2*x^-2 = -76 // : -100*53.8^2
x^-2 = (19*53.8^-2)/25
-2 < 0
1/(x^2) = (19*53.8^-2)/25 // * x^2
1 = ((19*53.8^-2)/25)*x^2 // : (19*53.8^-2)/25
(25*53.8^2)/19 = x^2
x^2 = (25*53.8^2)/19 // ^ 1/2
abs(x) = 269/(19^(1/2))
x = 269/(19^(1/2)) or x = -(269/(19^(1/2)))
x in { 269/(19^(1/2)), -(269/(19^(1/2))) }
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