January 5th, 2017, 10:55 AM  #1 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3  Domain of functions
how do I find the domain of these functions?

January 5th, 2017, 12:32 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,657 Thanks: 842 
3 rules concerning function domains will let you answer this a) $\sqrt{x} \rightarrow x \geq 0$ b) $\log(x) \rightarrow x > 0$ c) $\dfrac 1 x \rightarrow x \neq 0$ 
January 6th, 2017, 01:39 AM  #3 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3 
So for the first one it sholud be (4,\infty ) the second (2;3) the third (\infty ) fourth {\mathbb {R}} except 2 ? 
January 6th, 2017, 01:40 AM  #4 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3 
also I don't know how to plug in symbols 
January 6th, 2017, 01:41 AM  #5 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3 
You guys who understand math are like the rule masters of a huge game, math itself. mindblowing

January 6th, 2017, 04:42 AM  #6 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,878 Thanks: 766 
We read the rule book!

January 6th, 2017, 05:30 AM  #7 
Global Moderator Joined: Dec 2006 Posts: 18,250 Thanks: 1439 
If you type \$\infty\$ or [math]\infty[/math], it will be shown as $\infty$.

January 6th, 2017, 07:59 AM  #8 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3  

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