Question

Describe what the graph of interval

[-4,10] looks like?


what does the brackets mean?

Answer 1

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.

Answer 2

[-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)