Constants in an Algebraic Expression:–––––––––––––––––––––––––––––––––––––––––––––––
∙ Constants are the terms in the algebraic expression that contain only numbers. Their value remains same throughout the expression.
∙ That is, they're the terms without variables––––––––––––––––––––––.
Now, in expression 2p3+4q+7, we can observe that constant term is 7.