Question

The length of a rectangular box is 2 units less than its width.
If the area of the box is 15 units square.
Find the perimeter of the box.

Answer 1

Perimeter of box?
Length= w-2
Area= (w)(w-2)=15
\[w^2-2w=15\]
\[w^2-2w-15=0\]
w= -3, or 5 (but we can just throw out the -3 since the length and width can't be (-))

w=5, and l=3

Perimeter= 2(3)+2(5)=16 units