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September 20th, 2012, 06:41 PM  #1 
Newbie Joined: Sep 2012 Posts: 15 Thanks: 0  How do I express the domain in 'Interval Notation'?
Find domain for the function: f(x)= x+3/x^26x+8 The domain cannot be zero on the denominator so, once expanded it's: Domain: x (cannot equal) 4,2 How would I write that the domain is all real number except 4,2? 
September 20th, 2012, 07:01 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 462 Math Focus: Calculus/ODEs  Re: How do I express the domain in 'Interval Notation'?
In interval notation, this would be: 
September 20th, 2012, 07:06 PM  #3  
Newbie Joined: Sep 2012 Posts: 15 Thanks: 0  Re: How do I express the domain in 'Interval Notation'? Quote:
Because once I expand it's (x4)(x+2)=0 So the domain would be 4,2. Do I just express it as: (infinity,4)U(4,2)U(2,infinity) ??  
September 20th, 2012, 07:21 PM  #4 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,155 Thanks: 462 Math Focus: Calculus/ODEs  Re: How do I express the domain in 'Interval Notation'?
You had it right the first time: These are the values we exclude from the domain. 

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