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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)
(24*(x^2-420))/(x^2) = 0
( 24 )
24 = 0
x belongs to the empty set
( x^2-420 )
1*x^2 = 420 // : 1
x^2 = 420
x^2 = 420 // ^ 1/2
abs(x) = 2*105^(1/2)
x = 2*105^(1/2) or x = -(2*105^(1/2))
x in { 2*105^(1/2), -(2*105^(1/2)) }
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