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D( X )
2.5*X^3 = 0
2.5*X^3 = 0
2.5*X^3 = 0
2.5*X^3 = 0 // : 2.5
X^3 = 0
X = 0
X in (-oo:0) U (0:+oo)
(4.32*X)/(2.5*X^3) <= 1.5 // - 1.5
(4.32*X)/(2.5*X^3)-1.5 <= 0
1.728*X^-2 <= 1.5
1.728*X^-2 <= 1.5 // : 1.728
X^-2 <= 1.5/1.728
X^-2 <= 0.86805556
1/(X^2) <= 0.86805556
X <> 0
1/(X^2) <= 0.86805556 // * X^4
(X^4)/(X^2) <= 0.86805556*X^4
X^2 <= 0.86805556*X^4
X^2-0.86805556*X^4 <= 0
X^2*(1-0.86805556*X^2) <= 0
X^2*(1-0.86805556*X^2) <= 0 // : X^2
1-0.86805556*X^2 <= 0
1 <= 0.86805556*X^2 // : 0.86805556
1/0.86805556 <= X^2
X^2 >= 1/0.86805556 // ^ 1/2
abs(X) >= 1.15199999^(1/2)
X in (-oo:-1.15199999^(1/2)> U <1.15199999^(1/2):+oo)
X in (-oo:-1.15199999^(1/2)> U <1.15199999^(1/2):+oo)
(-oo:-1.15199999^(1/2)> U <1.15199999^(1/2):+oo)
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