hi, im doing this factoring assignment, and i cant figure out some of the problems , i'd be extremely glad if someone could help me.
(2m+8)^2 - (4m+5)^2 I have no idea how to start with this one
x^2 - 21x -72
(x-2)^2 -16 Is this one a difference of squares? and how do
i resolve it?
25x^2 +30xy + 9y^2 is this a tough polynomial? because i have no
idea how to resolve it, i got confused, or should i
resolve it using common factoring, only i've tried that and didnt work...