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Explanation & Answer
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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