#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<math.h>
int main()
{
	float a, b; float x1, x2; float c, t;
	while ((scanf("%f %f %f\n", &a, &b, &c)) != EOF)
	{    
		if (a == 0)
			printf("Not quadratic equation\n");
		else
		{
			t = (b*b) - 4 * a*c;
			if (t>0)
			{
				x1 = (-b - sqrt(t)) / (2 * a);
				x2 = (-b + sqrt(t)) / (2 * a);
				printf("x1=%.2f;x2=%.2f\n", x1, x2);

			}
			else if (t<0)
			{
				x1 = -b / (2 * a);
				x2 = sqrt(-t) / (2 * a);
				printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n", x1, x2, x1, x2);

			}
			else
			{
				x1 = (-b) / (2 * a);
				printf("x1=x2=%.2f\n", x1);
			}

		}


	}
	return 0;
}