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

$$(\sqrt{x}-\sqrt{a})(\sqrt{x}+\sqrt{a})$$
To write this as a product of two radical expressions, we look for expressions that multiply by each other to end up with this expression. Doing this, we find: $$(\sqrt{x}-\sqrt{a})(\sqrt{x}+\sqrt{a})$$