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x in (-oo:+oo)
0.5*(1/3)*x*x^2 = 972 // - 972
0.5*(1/3)*x*x^2-972 = 0
0.166666665*x^3 = 972 // : 0.166666665
x^3 = 5832.00005832
x^3 = 5832.00005832 // ^ 1/3
x = 5832.00005832^(1/3)
x = 5832.00005832^(1/3)
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