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

$$=x^3+x^2-22x-40$$
In order to solve this problem, we follow order of operations. Thus, we multiply and apply exponents first, and then we add and subtract. Doing this, we find: $$\left(x+2\right)\left(x+4\right)\left(x-5\right) \\ \left(x^2+6x+8\right)\left(x-5\right)\\=x^3+x^2-22x-40$$