January 5th, 2017, 09:55 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, 11:32 AM  #2 
Senior Member Joined: Sep 2015 From: Southern California, USA Posts: 1,495 Thanks: 753 
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, 12:39 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, 12:40 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, 12:41 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, 03:42 AM  #6 
Math Team Joined: Jan 2015 From: Alabama Posts: 2,731 Thanks: 707 
We read the rule book!

January 6th, 2017, 04:30 AM  #7 
Global Moderator Joined: Dec 2006 Posts: 18,052 Thanks: 1395 
If you type \$\infty\$ or [math]\infty[/math], it will be shown as $\infty$.

January 6th, 2017, 06:59 AM  #8 
Newbie Joined: Jan 2017 From: Italy Posts: 7 Thanks: 3  

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