Can someone help with domain and range?

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Can someone help with domain and range?

Mathematics
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FINALLY OS IS WORKING FOR ME. sorry for the delay
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that's just a rough sketch @mathmate can you help? I'm not sure because of the gap
Domain is the interval of defined values in the x axis. (That means they are not undefined.) Range is the interval of defined values in the y axis
I know what domain and range are xp
I have a test tomorrow and I'm doing a review sheet lol. I have half of it done xp
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yes I know something like that XD
but it's this particular graph that is bugging me
I'll help someone then. Pm me if you need further help.
|dw:1441325830620:dw| Knowing the interval notation also helps. http://www.coolmath.com/algebra/07-solving-inequalities/03-interval-notation-01
I know how to write interval notation and using inequalities lol XD
|dw:1441325962951:dw|
wouldn't it be [2,5)?
|dw:1441326076275:dw| Correction: \([2,5)\cup(9,\infty)\)
So it's all clear how you would approach your particular problem?
yes I know...so would the domain be [-5,-1)U(3,+inf)?
The 3 in incorrect. The point lies on the y-axis, so it's zero. 3 is the y-coordinate.
ooopppppppppsss. 0, I just realized that. sorry my sister was talking to me and I really can't focus
Note: all points on the y-axis have x-value=0.
Good, so you're all set!
Can't do the range, because there is not enough information.
yes I know XD I'm just frustrated. now how would I write that particular domain using equalities?
INequalities*** ugh
In set notation, you could write: \(\{x | -5\le x < -1 \cup 0
It is possible for the range is the parabola vertex is actually at 3
if the parabola*
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  • phi
the "little end" of < is next to the smaller value and the "fat end" is next to the bigger number if you want to say [2,5) you write \[ 2 \le x \lt 5\]
Do you mean (-3,2) ?
there I fixed that issue. *takes a deep breath* and I know @phi I just didn't know know if U was included or not
and yes I do omg I just can't get ANYTHING right today. I'm so sorry :(
  • phi
you use U if you have to glue together "separated" domains
So what do you propose for the range?
It's similar to the domain, but look along the y-axis.
  • phi
it looks like [0,2] U (3,inf)
that's what I was about to say @phi. I had to refresh
Is that an endpoint at the right side of the graph?
and no, it's an arrow
so set notation would be {\({y~|~0\le y \le 2 U 3
right? or am I wrong? idek. I'm about to give up and go to bed
  • phi
yes
thank you.

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