... units.Usually you may wish to take the tolerance to be (|x1| + |x2|)/2 where is themachine precision and x1 and x2are the initialbrackets. When the rootlies near zeroyou ought to consider carefully ... ",x2);}}CITED REFERENCES AND FURTHER READING:Stoer, J., and Bulirsch, R. 1980,Introduction to Numerical Analysis(New York: Springer-Verlag),Chapter 5.Acton, F.S. 1970,Numerical Methods ... fromx1-x2subdivide the interval intonequallyspaced segments, and search for zero crossings of the function.nbis input as the maximum num-ber of roots sought, and is reset to the number of bracketing...