The perimeter is the sum of the lengths of all sides of the figure.
4x- 36
Practice makes perfect
We want to write a linear expression in simplest form for the perimeter of a square that has a side length of (x-9) meters. Let's recall that every square has 4 congruent sides, so its perimeter is 4 times the length of one side. Therefore, we can write the following formula for the perimeter of our square.
4 (x-9)
Now, to simplify the above expression, let's distribute 4.
