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Answer:
First option is the correct answer
Step-by-step explanation
[tex] c^2 +2ab =(a+b) ^2 [/tex]
[tex] c^2 +\cancel{2ab} =a ^2 +\cancel{2ab}+b ^2 [/tex]
[tex] c^2 =a ^2 +b ^2 [/tex]
This is the Pentagons Theorem: