Abstract
The techniques of interpolation and extrapolation are used to analyze the behavior of deterministic process, particularly to predict this dynamics severalconditions. The main disadvantage in the analysis of a process appears on having defined the function
that it describes, in critical points of interest of the investigator. To solve this problem it is necessary to use techniques of approach of functions face to forecast of trayectories as interpolations an extrapolation bassed on expression of polinomic of different order