mizkiki55 said:it says to group and factor but i dont know how.
Loren said:Do you know how to factor the difference of two perfect squares?
From what you've posted, it appears you missed the chapter in the book (and / or the month in class...?) on factoring. To get caught up (so you can understand the various hints and solutions with which you've been provided), you'll need to learn that material. :shock:mizkiki55 said:
To find out, multiply your factors back together. :idea:mizkiki55 said:so would the answer be (x+3y-4)(x+3y+4)
x + 3y + 4
x + 3y - 4
--------------------------------
-4x - 12y - 16
3xy + 9y^2 + 12y
x^2 + 3xy + 4x
--------------------------------
x^2 + 6xy + 9y^2 - 16