Chapter 3 Word Problem Kirkland 4th Charles Turner The area in square feet of a rectangular field is x^2-120x+1100. The width, in feet, is x-10. What is the length, in feet? Notice the area of the trinomial x^2-120x+1100 is of the form ax^2+bx+c, a=1. Find the factors of 1100, which have a sum of -120. These are -10 and -110. Now factor the trinomial. Remember one of the factors of the trinomial is x-10. The length of the rectangular field, in feet, is x