Ian plans to build a fenced dog pen. At first, he planned for the pen to be a square of length x feet on each side, but then he decided that a square may not be best. He added 4 feet to the length and subtracted 3 feet from the width. The diagram below shows the dimensions of the new pen. Lenght: x + 4
Width: x − 3

Part 1 out of 2
Enter a polynomial in standard form that represents the amount of fencing that Ian will need for the new dog pen.