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D( x )
2*x^2 < 0
2*x^2 < 0
2*x^2 < 0
2*x^2 < 0
2*x^2 < 0 // : 2
x^2 < 0/2
x^2 < 0
x belongs to the empty set
x in (-oo:+oo)
24 = (2*x^2)^(1/2) // - (2*x^2)^(1/2)
24-(2*x^2)^(1/2) = 0
24-2^(1/2)*x = 0 // - 24
-2^(1/2)*x = -24 // : -2^(1/2)
x = -24/(-2^(1/2))
x = 24/(2^(1/2))
x = 24/(2^(1/2))
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