Are (x+y)2 and x2+y2 equal? why or why not?

They are not equal because if you distribute the 2 to the x and y on the 1st question you get 2x+2y which is not the same as x2+y2

Hope it helps comment for any questions!

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative