Vivian L. answered • 10/28/13
Tutor
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Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACH
Hi David;
f(x)=√(x-4)
We already know that a negative number cannot be square rooted.
Therefore, to understand the minimum value of the domain...
0=x-4
4=x
Domain; 4≤x
Range; 0≤y
Vivian L.
Hi Again;
You have to select between brackets and parenthesis.
A few weeks ago, I needed help with this too. Fellow tutor Michael F. of Wilton, CT, rescued me. It is only a coincidence that we both live in Connecticut. According to him,
"the parentheses ( and ) indicate no endpoints."
I am quoting out of context. But if I understand correctly, the ( ) means that the endpoint next to the ( or ) is NOT included. If I understand that correctly, then the [ ] are what is required here because
Domain; 4≤x
Range; 0≤y
It is EQUAL or greater than.
I cannot e-mail another tutor. You can.
http://www.wyzant.com/Tutors/CT/Wilton/8370790/
Please ask him and have him post his answer herein.
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10/28/13
Michael F.
The notation is for {x|a≤x<b} we write [a,b), for {x|a<x≤b} we write (a,b]
for the case x≥4 the usage is [4,∞)
in general when the end point is included use square brackets, when not use parentheses.
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10/29/13
Vivian L.
Thank you!
But in addition to using brackets and parentheses, you also use { and |. May I please know why?
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10/29/13
Bridget M.
10/28/13