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

int main() {

    // Forma directa
    printf("\n %f",(-(-1)+sqrt((-1)*(-1)-4*1*(-12)))/(2*1) );
    printf("\n %f",(-(-1)-sqrt((-1)*(-1)-4*1*(-12)))/(2*1) );


    // Usando variables
    double a = 1.0;
    double b = 4.0;
    double c = 1.0 ;   
    printf("\n %f",(-b+sqrt(b*b-4.0*a*c))/(2.0*a) );
    printf("\n %f",(-b-sqrt(b*b-4.0*a*c))/(2.0*a) );
}