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January 5th, 2017, 09:55 AM   #1
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Domain of functions

how do I find the domain of these functions?
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 January 5th, 2017, 11:32 AM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 1,944 Thanks: 1011 3 rules concerning function domains will let you answer this a) $\sqrt{x} \rightarrow x \geq 0$ b) $\log(x) \rightarrow x > 0$ c) $\dfrac 1 x \rightarrow x \neq 0$ Thanks from mark1
 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: 3,171 Thanks: 869 We read the rule book!
 January 6th, 2017, 04:30 AM #7 Global Moderator   Joined: Dec 2006 Posts: 18,967 Thanks: 1607 If you type \$\infty\$ or $\infty$, it will be shown as $\infty$. Thanks from mark1
January 6th, 2017, 06:59 AM   #8
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Quote:
 Originally Posted by Country Boy We read the rule book!
you are right, but you have to admit that there are a lot of rules

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