another factoring problem

[Guest]

Now i hindof understand this but I want to try another one. Can you write this out in steps

2
4r-4r+1

 

[tkhunny]

Set it up...

(___r - 1)*(___r - 1)

Fill in the blanks. There are only a couple of possible factorizations of 4.

(r - 1)*(4r - 1)
(2r - 1)*(2r - 1)

Which one works?