Question

I need help with that

Answer 1

Domain: x
`\leq` 8

Explanation:

All real numbers minors than or equal to 8

Hope this helps

Answer 2

The domain of a function is where the function can exist

For the function in part (a), it can only exist where the things inside the square root aren't negative.

The things inside the square root become negative when x is smaller than 8.

Thus the function's domain is [8,∞).

The reason why I put the bracket on the left side is that the domain contains 8.

Hope that helps!