Im failing math rn I'll burn most my just for someone to help my sorry tushy out :')​

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?