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D( x )
x < 0
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 in (0:+oo)
120-(31250/(x^(3/2))) = 0
120-31250*x^(-(3/2)) = 0
-31250*x^(-3/2) = -120 // : -31250
x^(-3/2) = 12/3125
-3/2 < 0
1/(x^(3/2)) = 12/3125 // * x^(3/2)
1 = 12/3125*x^(3/2) // : 12/3125
3125/12 = x^(3/2)
x^(3/2) = 3125/12 // ^ 2
x^3 = 9765625/144 // ^ 1/3
x = (9765625/144)^(1/3)
x = (9765625/144)^(1/3)
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