Question

A rectangle's length is three times its width.  Let w denote the rectangle's width.  What polynomial represents the rectangle's area? 

Answer 1

Width = ' W '
Length = 3 times as long = 3W

Area = (length) x (width) = (3W) x (W) = 3W²

Answer 2

Width = W
Length = 3W

Area = Length * Breadth

= 3W * W

= 3W²