What is an expression for the perimeter of this rectangle?

Question

On the length of the rectangle (long side), it is "n^2 + 5n + 6". On the width of the rectangle (short side), it is "n^2 - 4".

Answer 1

P = 2(L + W)

L = n² + 5n + 6

W = n² - 4

Plug L and W into the equation for P and simplify.