Squere equation

#include <stdio.h>
#include <math.h>
#include<conio.h>
int main()
{
    float a, b, c, delta, x1, x2;
    printf("a = ");
    scanf("%f", &a);
    printf("b = ");
    scanf("%f", &b);
    printf("c = ");
    scanf("%f", &c);

    if(a!=0)
    {
        delta = pow(b,2)-4*a*c;
        if(delta < 0)
        {
            printf("no solution\n");
        }
        else if (delta == 0 )
        {
            x1 = x2 = (-b/2*a);

        }
        else
        {
            x1 = ((-b- sqrt(delta))/(2*a));
            x2 = ((-b+ sqrt(delta))/(2*a));
        }
        printf("%f, %f", x1, x2);
    }
else printf(" incorrect a value");

   return 0;
}