Posted by Mady on .
The legnth of a rectangular floor is 2 feet more than it's width. The area of the floor is 168 square feet. Kim wants to use a rug in the middle of the room and leave a 2 foot border of the floor visible on all sides. What should the legnth of the rug be?

12th gradeMath 
DrBob222,
Your first job should be to determine the dimensions of the floor.
Let X = width, then
X + 2 = length.
The area is 168; therefore,
X(X+2) = 168 which expands to
X^2 + 2X  168.
Solve that for X and X+2 then look to see how much smaller the rug should be. Post your work if you get stuck. 
12th grade 
Natalie,
the rug should 2