#include<stdio.h>

int main()
{
  //int low=0,high=0;
  float a = 0,b=0,c=0,pC;
  printf("Polynomial used : P(x)= (35x^4 - 30x^2 - 3)/8 \n Enter a nd b as : a,b :");
  scanf("%f,%f",&a,&b);
  //float diff = 0;
  do
  {
    float pA = (35*a*a*a*a - 30*a*a*a - 3)/8;
    float pB = (35*b*b*b*b - 30*b*b*b - 3)/8;
    c = (a + b)/2;
    float pC = (35*c*c*c*c - 30*c*c*c - 3)/8;
    
    if((pA > 0 && pC<0 ) || (pA<0 && pC>0))
    {
      b = (a+b)/2;
    }
    if( (pB>0 && pC<0) || (pB<0 && pC>0))
    {
      a = (a+b)/2;
    }
  }while(pC>0.00001);
  
  printf("Root of Polynomial : %f \n",c);
  return 0;
}