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The ln(y) is only defined for positive values of y.

So, ln(x2 + 2x - 8) is defined only for x2 + 2x - 8 > 0

ie for x< -4 or x > 2

So the domain is x< -4 or [union] x > 2

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Q: What is the domain of ln x2 plus 2x minus 8?
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