10366.c

#include<stdio.h>
#include<math.h>

int main()
{
    double A,B,C,R1,R2;
     scanf("%lf%lf%lf",&A,&B,&C);

     R1 = (-B + (sqrt((B*B) - 4*A*C)))/(2*A);

     R2 = (-B - (sqrt((B*B) - 4*A*C)))/(2*A);



     if(((B*B)-4*A*C)<0 || A==0 )
     {
         printf("Impossivel calcular\n");
     }
     else
     {
         printf("R1 = %.5lf\n",R1);

          printf("R2 = %.5lf\n",R2);
     }

     return 0;
}