89ExplorationofCalculatingtheRangeofQuadraticFunctionLIUJian-zhong(FushunNo.1highschool,Liaoningprovince,Fushun113001,China)Abstract:Therearemanymethodstocalculatetherangeoffunction.Itiscommontousequadraticfunctiontodefinetherangeofafunction.Inthispaper,wetooksomeexamplestodiscussthismethod.Keywords:Function;Range;Quadraticfunction82