[ includes endpoint ( doesn’t include endpoint Interval Notation [ includes endpoint ( doesn’t include endpoint

Example 1 Example 2 -1 4 3 5 3 ≤ x < 5 [3,5) -1 ≤ x ≤ 4 [-1,4]

Note: -2 > x > 3 is not acceptable. Example 3 -2 3 Note: -2 > x > 3 is not acceptable. Note: Always use a parentheses for infinity.

Example 4 5 Note: 0 > x ≥ 5 is not acceptable since there is no value of x that can be less than 0 and greater than 5.

Practice Problems in class: Write each given interval in interval notation: -1 3 6