Alexander B. answered • 05/16/18

PhD in Engineering with 10 Years of jQuery programming experience

First, let's write down the system of 2 equations with 2 unknown variables: W (width) and L (length) as following

L - W = 4 (because width is 4m shorter than length)

LW = 320 (the area)

Substitute W = 320/L

L - 320/L = 4

or to put it in canonical form:

L

^{2}- 4L - 320 = 0This quadratic equation has 2 solutions, but only one positive: L = 20. Therefore, W = 16.

The answer: L (length) = 20m, W (width) = 16m