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Question 307292: find the domain of the function
f(x)=sqrt (x+8)
what is the domain of f?
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! In this function  , you have a SQUARE ROOT. The RADICAND (that is, whatever is INSIDE the square root) must NEVER be negative. The RADICAND must be GREATER than or EQUAL TO 0.
In this case, the domain is  , so  .
Please see my explanation of this topic on my own website. Go to "www2.seminolestate.edu/rrapalje". Look for the link on my Homepage "MATH IN LIVING COLOR", and look under either Intermediate (Chapter 5) OR College Algebra (Chapter 2).
I also have a video of my own teaching in class a few years ago. To see the videos, look for "Rapalje Videos in Living Color", and see either Intermediate or College Algebra for the topic "Functions, Domain, and Range".
I think you will find the explanations, both written and video, much easier to understand than traditional textbooks. My own students did!!
Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus
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