%0 Journal Article %T A Fixed Point Approach to the Stability of Quintic and Sextic Functional Equations in Quasi- -Normed Spaces %A Xu TianZhou %A Rassias JohnMichael %A Rassias MatinaJohn %A Xu WanXin %J Journal of Inequalities and Applications %D 2010 %I Springer %X We achieve the general solution of the quintic functional equation and the sextic functional equation . Moreover, we prove the stability of the quintic and sextic functional equations in quasi- -normed spaces via fixed point method. %U http://www.journalofinequalitiesandapplications.com/content/2010/423231