Describe what the graph of interval
[-4,10] looks like?
what does the brackets mean?
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.
[-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)
The graph of the interval [-4,10] would be a line segment on a number line. The left endpoint is -4 and the right endpoint is 10. It includes all the points between -4 and 10, including the endpoints.
The brackets, in the context of intervals, indicate whether the endpoints are included or excluded. In this case, the square brackets [ ] mean that both -4 and 10 are included in the interval. If it were written with round brackets ( ), such as (-4, 10), it would mean that -4 and 10 are excluded from the interval and only the points between -4 and 10 are included.