Question

4. Find the domain I've got no clue, the lesson made no sense to me either.

Answer 1

x is greater than or equal to -4 but less than or equal to 4

Explanation:

The "domain" is all of the x values on the line. But there are an infinite amount of x-values there, so it must be written as that.

Answer 2

See below.

Explanation:

The domain is simply the range of x-values the graph encompasses. From the given graph, we can see that the graph stretches from x=-4 to x=+4.

However, note that the graph does not include -4 since the point is an open circle. However, it does include +4 since the point is a closed circle. Therefore, the domain of this graph is:

In interval notation:

`(-4,4]`

(Parenthesis on the left because -4 is not included. Brackets on the right because +4 is included.)