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Polynomialshard
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Which condition is necessary for the polynomial P(x)=x4+ax3+bx2+cx+dP(x) = x^4 + ax^3 + bx^2 + cx + dP(x)=x4+ax3+bx2+cx+d to be the square of a quadratic Q(x)=x2+px+qQ(x) = x^2 + px + qQ(x)=x2+px+q?