What's a good word to describe the operation of taking the negative of a number?
For example, given
x = 5, obtain
-x = -5, and given
y = -2, obtain
-y = 2.
Is there a word for this?
I was thinking about "negation" or "negate". But according to M-W, it means:
to cause (something) to not be effective
grammar : to make (a word or phrase) negative
It doesn't seem to cover "to make a number negative".