What is i completed my homework in french?

There are a couple of ways to say "I completed my homework" in French, depending on the context and level of formality:

Formal:

* J'ai terminé mes devoirs. (This is the most literal and formal translation.)

Informal:

* J'ai fini mes devoirs. (This is a more common and casual way to say it.)

You can also use a more specific verb like "faire" (to do):

* J'ai fait mes devoirs. (This translates to "I did my homework.")

The best choice for you will depend on the specific situation and who you are speaking to.