What is the correct spelling when adding 'ed' to the word 'fix'?

When adding 'ed' to the word 'fix', the correct spelling is 'fixed'. This follows the standard rule of forming the past tense of regular verbs in English. The base form 'fix' ends with a consonant, and simply adding 'ed' results in 'fixed'. This adheres to English spelling conventions, ensuring the verb retains its original pronunciation while correctly indicating the past tense.

Other options, such as 'fixxed' and 'fixe', do not conform to standard English spelling rules. 'Fixxed' adds an unnecessary extra 'x', which is not how the past tense is formed for this verb. 'Fixe' omits the 'd' entirely, which also fails to represent the past tense. Therefore, 'fixed' is the appropriately spelled past tense of 'fix'.