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D( X )
X^(3/2) = 0
X < 0
X^(3/2) = 0
X^(3/2) = 0
1*X^(3/2) = 0 // : 1
X^(3/2) = 0
X = 0
X < 0
X in (0:+oo)
45000/(X^(3/2)) = 120 // - 120
45000/(X^(3/2))-120 = 0
45000*X^(-3/2) = 120 // : 45000
X^(-3/2) = 1/375
-3/2 < 0
1/(X^(3/2)) = 1/375 // * X^(3/2)
1 = 1/375*X^(3/2) // : 1/375
375 = X^(3/2)
X^(3/2) = 375 // ^ 2
X^3 = 140625 // ^ 1/3
X = 25*9^(1/3)
X = 25*9^(1/3)
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