
1 Attachment(s)
Problem solving
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)

E
this represent the Width and L(Evilgrin)ength of the photograph
W x L = Area

The the dimensions of the picture is the whole frame length  2x. It is 2x because there are 2 of them on both sides.
So we have (1002x)(1502x) which is E