There are many ways we can write one of them being that we just write 11 fives being multiplied against each other like the following:
This can seem very repetitive which is why powers are a lot more helpful. We can also rewrite using the power in the bottom of a fraction. The way that we do this is put on the bottom which can then be flipped to the top with a positive power and will be the same.
The final way that we can rewrite is by using several different powers. We can do which will equal the same thing as because the base is the same and what we basically do is just add up the powers together to get back to 11.