Posted by **scooby9132002** on Friday, June 26, 2009 at 5:15pm.

Describe what the graph of interval

[-4,10] looks like?

what does the brackets mean?

- math -
**Reiny**, Friday, June 26, 2009 at 5:25pm
It is supposed to mean between -4 and 10, but I never remember if the end points are included in this notation.

I never used that notation, I use something like

-4 ≤ x ≤ 10 or -4 < x < 10

So it means that you are only concerned about the graph that falls within those two values of x .

Clarify from your text or your instructor whether the endpoints are included or exclude.

- math -
**MathMate**, Friday, June 26, 2009 at 5:58pm
[-4,10] means -4<=x<=10

The square brackets mean that the limites are included in the interval.

If a limit is to be excluded, use the parentheis or turn the brackets backwards.

(-4,10] means -4 < x <=10.

]-4,10] also means -4 < x <=10

See:

http://en.wikipedia.org/wiki/Interval_(mathematics)

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