code: public static double quadratic( double f0 , double g0 , double x0 , double f1 , double x1 ) {
  
  		return x0 + ((g0/((f0-f1)/(x1-x0)+g0))/2.0)*(x1-x0);
  	}
docs: <p>
  Quadratic interpolation using two function values and one derivative.
  </p>
  
  @param f0 Value of f(x0)
  @param g0 Derivative f'(x0)
  @param x0 First sample point
  @param f1 Value of f(x1)
  @param x1 Second sample point
  @return Interpolated point