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[tex]f= x^{3}+ a x^{2} +bx+c [/tex] | unde a,b,c apartin multimii numerelor rationale

a) determinati a,b,c stiind ca f are rad x1=x2=1 si x3=-2
b) daca f are radacina [tex] \sqrt{2} [/tex], atunci f are o radacina rationala