Which equation is represented by the model?

x2–2x-3 = (x – 3)(x + 1)
x2 - 4x + 3 = (x – 3)(x - 1)
x2 + 2x + 3 = (x + 3)(x - 1)
x2 + 4x – 3 = (x + 3)(x + 1)

Afarmer has a large field that is x feet in length. he wants to fence in a rectangular section in the middle of the field , leaving a length of 100 feet of open field behind each end of the fenced rectangle.he also wants the width of the fenced-in space to be 100 feet less than its length. find the expressions to represent the length and width of the fenced section of the field