find domain of y = (x^2-4)/(x^2+x-2); write in int. notn.  TOPIC_SOLVED

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find domain of y = (x^2-4)/(x^2+x-2); write in int. notn.

Postby imanangel0356 on Thu Sep 10, 2009 1:29 am

Find the domain. Write the anwer in interval notation.

y = (x^2-4)/(x^2+x-2)

I can not figure this algebra equation out. Please help and thank you!
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Postby stapel_eliz on Thu Sep 10, 2009 1:04 pm

The domain is the set of allowable x-values. You have been given a rational function. In particular, you have been given a function which has x's in the denominator. Think about what you cannot do in a fraction, what you cannot divide by....

For worked examples of how to find domains, please review this page.

To solve, you'll need to find the zeroes of the denominator. The quadratic does factor, but you can also use the Quadratic Formula, if you prefer. :wink:
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