Michael J. answered 05/13/15
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Effective High School STEM Tutor & CUNY Math Peer Leader
I am assuming that (x + 3) is under the radical.
3√(x + 3)
We can have a negative value under a cube-root, since negative times negative time negative give you a negative product.
-2 * -2 * -2 = -8
Therefore, you can use any value of x to find the function values.