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If: x2-x-2 = 0
Then: x = -1 or x = 2
* * * * *
Those are the roots of the equation when y = 0, which has little to do with the domain. The domain is the set of values for x such that y has a defined unique value. Unless there is some other constraint the domain is likely to be the Real numbers. Although, of course, it could be the integers or the complex plain.
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