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Question 307290: find the domain of the function
f(x)=12/x-15
what is the domain of f?
Answer by rapaljer(4671)   (Show Source):
You can put this solution on YOUR website! f(x)=12/x-15
In the real numbers, DENOMINATORS must NOT equal zero. Since there is a denominator in this function, there is a restriction that x-15 must NOT equal zero. The forbidden value is x=15. All other values are permitted. The domain is all values EXCEPT x=15.
You really should see my explanation of this topic on my own website. Please 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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