Domain of function with radical in the numerator

The video tutorial discusses two mathematical restrictions involving radicals and powers. The first restriction requires the radicand to be greater than or equal to zero, while the second involves understanding that no real number raised to an even power can result in a negative number. The tutorial explains why only the first restriction is relevant and concludes with the solution that x must be greater than or equal to six.

What is the first restriction mentioned regarding the radican?

Describe the implications of the second restriction mentioned in the text.

Explain why there is no real number that can be raised to the fourth power to equal -1.

How does the teacher conclude the discussion on restrictions?

What is the significance of the radical in the context of the restrictions?