Question 63907
  let the length of a side of the original sq. be  'a in.'
     now it's 'a+7 in '
  
 area  becomes (a+7)^2 in^2
  or  (a+7)^2 = 121
  
  or  a+7  = 11 [neglecting the -ve solun]
  
  or  a = 11-7 =4
  

  ans is 4 in