ENTERING INTERVAL ANSWERS
For intervals of values, enter your answer using interval notation. Here are some examples of how interval notation relates to inequalities:
| Inequality | Interval Notation |
|---|---|
| 3 < x < 5 | (3, 5) |
| 3 < x ≤ 5 | (3, 5] |
| x > 3 | (3,∞) |
| 3 < x < 5 or 7 < x < 9 | (3, 5)∪(7, 9) |
With inequalities, we use "less than" (<) or "greater than" (>) to exclude the endpoint of the interval. With interval notation, we use use round parentheses: ( , ).
With inequalities, we use "less than or equal to" (≤) or "greater than or equal to" (≥) to include the endpoint of the interval. With interval notation, we use use square brackets: [ , ].
To combine two intervals, use U (an uppercase letter u) for union: ∪.
Use oo (two lowercase letter o's) for infinity: ∞.
Try it now. Enter the interval equivalent to 2 < x ≤ 5 or x > 7.
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