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put this solution on YOUR website!
To find the domain of a rational expression, you must solve the denominator equal to 0--also known as the vertical asymptote.
Never, ever, in a 1000 years can a denominator be 0. This is undefined!!! -4 in the denominator makes it -8 (which is possible and can be included in the domain; however, 4 makes the denominator 0. 4 in the denominator is impossible--no such thing! Try to put 8/0 in your calculator. You will get an error message.
Maybe you're looking at the numerator instead.
-4 + 4 = 0
A 0 in the numerator is perfectly A OK. If you were to put this in your calculator you would get 0. 0 divided by anything is 0. This is -4 is included in the domain.
If this doesn't help--PLEASE write back.
Thanks
MS
You can
put this solution on YOUR website!if you had
then what happens when c is +4?...the deniminator becomes zero and you have a "divide by zero" situation...which is not good, mathematically!
so, the domain states, you can have any value you like but NOT 4.
Make sense?
jon
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