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Whether or not a function has zeros depends on the domain over which it is defined.

For example, the linear equation 2x = 3 has no zeros if the domain is the set of integers (whole numbers) but if you allow rational numbers then x = 1.5 is a zero.
A quadratic function such as x^2 = 2 has no rational zeros, but it does have irrational zeros which are sqrt(2) and -sqrt(2).


Similarly, a quadratic equation need not have real zeros. It will have zeros if the domain is extended to the complex field.


In the coordinate plane, a quadratic without zeros will either be wholly above the horizontal axis or wholly below it.

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