under root 2 + under root 2= ?

Two underroot 2
  • -1
root 2 + root 2 
= 2root2
  • 0
2 root 2
  • -1
2 root 2
  • 0
2 root 2
  • 0
as
  • 0
2 underroot 2
  • 0
2* root2
  • 0
2 root 2
  • 1
2 root 2
  • 0
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