//(c) kreator, '98
// ax+b=cx**2+d
#include <stdio.h>
#include <math.h>

void main(void)
{
	int a, b, c, d;
	float D;

	printf("Unesi a, b, c, d ");
	scanf("%d %d %d %d", &a, &b, &c, &d);
	D=a*a-4.*(d-b)*c;

	if ((D<0) || (c==0)) printf("rjesenja nema..\n");
		else printf("x1= %f, x2= %f\n", (a+sqrt(D))/(2.*c), (a-sqrt(D))/(2.*c));
}