## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$$\frac{x-4}{x+4}$$
In order to simplify the given expression, we look for common factors in the numerator and the denominator. Next, we cancel out these common factors to simplify completely. Doing this, we find: $$\frac{\left(x-4\right)^2}{\left(x+4\right)\left(x-4\right)}\\ \frac{x-4}{x+4}$$