Question 323610
A picture frame has a length l = 13 inches and the height of h= 11 inches. If the frame width is x inches, write and expression for the display area of the frame.
L=13
h=11
..
x is the width on both sides
so you have to subtract  x+x to get the length and breadth of the display area
..
display area length will be 13-2x
display area height = 11-2x
..
Area of display area = (13-2x)(11-2x)