My Math Forum functions of several variables

 Pre-Calculus Pre-Calculus Math Forum

 December 21st, 2018, 02:56 AM #1 Newbie   Joined: Dec 2018 From: egypt Posts: 3 Thanks: 0 functions of several variables How do I find the range for ln(9 - x^2 - y^2 - z^2)? Thanks. Last edited by skipjack; December 21st, 2018 at 03:43 AM.
 December 21st, 2018, 03:44 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,467 Thanks: 2038 Can you make a guess as to what the range is?
 December 21st, 2018, 03:50 AM #3 Newbie   Joined: Dec 2018 From: egypt Posts: 3 Thanks: 0 i do know what the range so it wouldn't be a guess =) but i don't understand how we got it.
 December 21st, 2018, 04:05 AM #4 Senior Member   Joined: Dec 2015 From: iPhone Posts: 474 Thanks: 73 Let $\displaystyle x^2+y^2+z^2=t^2$ $\displaystyle f(t)=\ln(9-t^2 )$ , by domain $\displaystyle |t|<3$ \$\displaystyle \lim_{t\rightarrow 3} f(t)

 Tags functions, variables

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post kaybees17 Advanced Statistics 2 December 2nd, 2013 07:46 AM Thy-Duang Real Analysis 16 May 15th, 2013 01:15 PM PhizKid Trigonometry 4 January 31st, 2013 08:46 AM token22 Real Analysis 1 September 26th, 2011 11:38 AM galahad Advanced Statistics 1 April 30th, 2010 01:09 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top