Domain of the square root function

The video tutorial explains how to handle radicals and their impact on domain restrictions. It covers the importance of understanding the domain for square roots, emphasizing that the domain is defined for values greater than or equal to zero. The tutorial also discusses the effect of numbers outside the radical and how they do not impact the domain. It further explains solving inequalities involving radicals, highlighting the need to flip the inequality sign when multiplying or dividing by a negative number. Finally, it touches on graphing solutions and confirming the validity of the domain.

How would you describe the range of numbers less than or equal to -1?

What is a basic identity of the domain related to square roots?