There are 12 ordered pairs of integers (x,y) that satisfy x^2 + y^2 = 25.  What is the sum of all the x-values?


[help Number Theory](/questions/help-number-theory_32)
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For each value of $x,$ there is a negative value of $x.$ So, the answer to this problem is $\boxed0$


The answer is stated in the question !! There are 12 pairs as follows:

  

  x       y

   0     -5         
 -3     -4  
 3      -4  
 -4    -3  
 4     -3  
 -5     0  
 5      0  
 -4    3  
 4     3  
 -3   4  
 3    4  
 0    5

