Question 66088
Let the width of the poster be w
Then length = (w+4)

When there is a frame of 2 inches wide,
length of the frame = (w+4) +2 + 2
                    = w + 8


Width of the frame = (w) + 2+ 2
                   = w + 4

Area = length * width
==> (w+8)(w+4) = 672


Good Luck!!!