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Javydreamercsw · Answer 1 · 2018-03-08T13:39:00+0000

The domain would be all real numbers, which you can represent with the interval
$(-\infty,\infty)$

The range would be all numbers below (and including) the y-coordinate of the vertex, which appears to be at (2,6). So the range is, in interval form,
$(\infty,6]$ .

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