Calculate roots of an equation

#include<stdio.h>
#include<conio.h>
#include<math.h>
int main()
{
float x,r1,r2,a,b,c;
clrscr();
printf("Enter the values of. a,b,c");
scanf("%f%f%f",&a,&b,&c);
x=sqrt(b*b-(4*a*c));
r1=(-b+x)/2*a;
r2=(-b-x)/2*a;
if(x>0)
printf("\n Roots are unequal \n");
else if(x<0)
printf("\n Roots are imaginary\n");
else
printf("\n Roots are same \n");
printf("R1= %f",r1);
printf("R2 = %f",r2);
getch();
return 0;
}