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On the Hyers-Ulam Stability of Quadratic Functional Equations  
 
  Authors: Ick-Soon Chang, Hark-Mahn Kim,  
  Keywords: Hyers-Ulam-Rassias stability, Quadratic function.  
  Date Received: 11/01/02  
  Date Accepted: 19/02/02  
  Subject Codes:

39B22,39B52,39B72.

  
  Editors: Themistocles M. Rassias,  
 
  Abstract:

In this paper, we obtain the general solution and the generalized Hyers-Ulam stability for quadratic functional equations $ f(2x+y)+f(2x-y) =f(x+y)+f(x-y)+6f(x)$ and $ f(2x+y)+f(x+2y) =4f(x+y)+f(x)+f(y)$.;


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