The length of a rectangle is 7 inches more than 5 times its width. The area of the rectangle is 16 square inches. What is the width?
W = W
L = 5W + 7
LW = area
W ( 5W + 7) = 16
5W^2 + 7W = 16
5W^2 + 7W - 16 = 0
-7 + sqrt [ 7^2 - 4*5* -16 ] -7 + sqrt [ 369]
W = ___________________________ = ________________ ≈ 1.22 in
2(5) 10
