Question

Use the formula for the area of a rectangle A= lw to answer the question. A rectangle has a length of n units. Its width is 8 units more than its length. What is the area of the rectangle?

Answer 1

A = L * W
L = n
W = n + 8

A = n(n + 8)
A = n^2 + 8n <==

Answer 2

It is D: n(n+4). I solved it by a long, but easy method. First, I made up the value of N, the width, and made it 3. I then added 4 to 3, which is 7. So the length is 7 and the width is 3. The area of this made up rectangle is 21. The only answer choice that has 21 as the area is D.