a = 6; b= 13 ; c= -28

Roots are (-13-sqrt(169+672))/12 ; (-13+sqrt(169+672))/12

(-13-29)/12,(-13+29)/12

-7/2 ,4/3

a= 20 ; b= 11 ; c =-3

Roots are (-11-sqrt(121+240))/40 ; (-11+sqrt(121+240))/4

(-11-19)/40, (-11+19)/40 = -3/4 , 1/5

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