equations Deuxieme degree

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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
{
    int a,b,c;
    double delta ;
    float x,x2;

    printf("Pour resoudre une equation du second degree ( ax^2 + bx + c = 0 )\n");
    printf("Entrez les valeurs de a b et c : ");
    scanf("%d %d %d",&a,&b,&c);
    /*********************************
    calcul de delta
    **************************/
    delta = pow(b,2)- 4*a*c;

    /*************************
        les racines selon delta
    *****************************/
    if(delta==0) printf("l equation a une racine x = %.2f ",-b/(2*a));
    else if(delta>0)
    {
        x = -b - sqrt(delta)/(2*a);
        x2 = -b + sqrt(delta) / (2*a);
        printf("l equation a deux racines \n");
        printf("\tx1 = %.2f \n",x);
        printf("\tx2 = %.2f \n",x2);
    }else
    {
        x=sqrt(-delta)/(2*a);
        x2=-b/(2*a);

        printf("\ndelta <0\n");
        printf("x1 = %.2f - %.2fi\n",x2,x);
        printf("x2 = %.2f + %.2fi\n",x2,x);
    }

    return 0;
}