Now that you have mastered factoring and expanding linear expressions, let's solve the
problem in the Real-World Connection.
A town is planning to build an equilateral triangle-shaped field for residents to use as a
playground. A diagram of the field is shown below. The exact size of the field has not yet
been determined, but in the blueprint, the perimeter is written as 30x + 9. The term 30x
represents the part of the field that will be fenced in, and 9 represents the unfenced areas.
What expression represents each side length of the field?
Perimeter: 30x + 9