how to plug the numbers from first order condition to the quadratic equation?

I don't know how to get value for a,b,and c

River Bottom Farm Behavior in a Cournot Market Structure From the information provided, we can express River Bottom Farm's prot function as R = (10 0.005(qA + qRDqR (00002493 0.048qf, + 3.4qR) River Bottom Farm's objective is to maximize angiven its choice of (13. Its rst-order condition is 371' 0 R = 10 0.01qR 0.005% 0.00072q}, + 0.096;\