TITLE: Name for quadratic functions with no linear term
QUESTION [5 upvotes]: Is there any special name for a function of the form $ax^2+c$
(i.e. a quadratic function with no linear term)?
"centered quadratic" or something?

REPLY [8 votes]: As hinted by Peter and confirmed by Web search, this is called a pure quadratic. https://develacademy.com/pure-quadratic-equation/