C :

#include<stdio.h>
#include<math.h>
main()
{
	float a,b,c,disc,p,q;
	scanf("%f,%f,%f",&a,&b,&c);
	disc = b*b-4*a*c;
	p = -b/(2*a);
	q = sqrt(disc)/(2*a);
	printf("%0.2f,%0.2f",p+q,p-q);
}