Here's why:
* Noun: A word that names a person, place, thing, or idea.
* Phrase: A group of words that work together to express a single idea.
In this case, "inverse operation" refers to a specific concept in mathematics, which makes it a noun. The entire phrase acts as a single unit to describe that concept.
Here are some examples of how "inverse operation" can be used as a noun:
* "The inverse operation of addition is subtraction."
* "Knowing inverse operations is essential for solving equations."
* "The teacher explained the concept of inverse operations to the students."