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x1 + x2 = -3/2
x1 * x2 = - 4/2 = -2
x1^3 + x2^3 = (x1 + x2)^3 - 3x1^2*x2 - 3x1*x2^2
= (-3/2)^3 - 3x1*x2*(x1+x2)
= -27/8 - 3*(-2)*(-3/2)
= -27/8 - 9
= -12-3/8
x1 * x2 = - 4/2 = -2
x1^3 + x2^3 = (x1 + x2)^3 - 3x1^2*x2 - 3x1*x2^2
= (-3/2)^3 - 3x1*x2*(x1+x2)
= -27/8 - 3*(-2)*(-3/2)
= -27/8 - 9
= -12-3/8
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