This diagram shows a photograph (shaded) mounted on cardboard.
The cardboard measures 100 mm by 150 mm, and the boarder around the photograph is a uniform x mm wide.
Which is the expression (in mm) for the area of the photograph.
A 150 x 100 - 150x -100x
B 100 x 150 - 4x^ (this is meant to be 2 squared)
C 100 x150 - 4x
D (100 + 2x)(150+2x)
E (100 - 2x)(150 - 2x)