Question

The length of a rectangle is 4 units less than twice the width. What is the length if the area of the rectangle is 160 square units?
Enter your answer as a number, like this: 42

Do not enter any units.

Answer 1

A) L = (2*W) -4
B) L*W = 160
B) L = 160/W
Substituting that into A)
160/W = (2*W) -4
160 = 2W^2 -4W
2W^2 -4W-160 = 0
Width = 10
Length = 16