Given
A digital picture frame with a border of 3 cm. The actual length of the frame is x
Answer
a) The actual side of the picture is x-3
Area of picture
[tex]=(side)^2=(x-3)^2[/tex]
b) Area of frame
[tex]x^2[/tex]
c) Area of border = Area of frame - area of picture
[tex]x^2-(x-3)^2[/tex]
