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题目(2010年五校联考自主招生考试)设u是方程x3-3x+10=0的根,f(x)是系数为有理数的二次多项式,且α=12(u2+u-2),f(α)=u,
(U2 + u = 2) where u is the root of the equation x3-3x + 10 = 0 and f (x) is a quadratic polynomial whose coefficient is rational and α = 12 (u2 + u-2) , f (α) = u,