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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/2) = -15/8 // + -15/8
x^(3/2)-(-15/8) = 0
x^(3/2)+15/8 = 0
1*x^(3/2) = -15/8 // : 1
x^(3/2) = -15/8
x^(3/2) = -15/8 // ^ 2
x^3 = 225/64 // ^ 1/3
x = (225/64)^(1/3)
x = (225/64)^(1/3)
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