ESTIMATE OF DISK NOT CONTAINING ROOTS OF POLYNOMIAL FUNCTIONS

Suppose we have a polynomial function. Also suppose coefficients of polynomial follow a certain pattern of decreasing or increasing in magnitude. Then we have many results for providing the regions containing all the roots of polynomial functions. Here, in this paper we prove a result that gives a disk or circular region containing no roots of function, thereby our result finally gives annular region containing all roots of polynomial function and hence thereby improves the earlier proved, results.