A rectangular porch has an area of 75 square feet. The length of the porch is 4 feet longer than the width. What is the width of the porch?

X * (x + 4) = 75

x^2 + 4x - 75 = 0

x = [-4 + sq root (316) ] / 2

x = 13.7763888346 / 2

x = 6.8881944173

x = 6.888 (rounded)

Width = 6.888

Length = Width + 4

Width = 10.888

Double Check

6.888 * 10.888 = 75 square feet