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March 26th, 2017, 06:22 AM  #1 
Newbie Joined: Aug 2016 From: Brasil Posts: 17 Thanks: 0 
1) Determine the domain of the following function: Answer: Domain [4,4] That is the answer of the exercise, but I wanted to know how to get that result. I could not understand. Last edited by skipjack; March 26th, 2017 at 07:02 AM. 
March 26th, 2017, 06:52 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 17,919 Thanks: 1386 
For the function to be real, √(25  x²) $\small\geqslant$ 3, so 25  x² $\small\geqslant$ 9. That's equivalent to x² $\small\leqslant$ 16, which means that the domain is [4, 4]. 
March 26th, 2017, 07:25 AM  #3 
Newbie Joined: Aug 2016 From: Brasil Posts: 17 Thanks: 0 
thank very much my friend!!! Awesome!!


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