Answer
$(-∞,-3)∪(-3,5)∪(5,∞)$
Work Step by Step
Making $x=−3,5$ results in an undefined function, so those values are excluded from the domain.
$g(x)=\frac{3}{x^2-2x-15}$
$g(x)=\frac{3}{(x+3)(x-5)}$
$(-∞,-3)∪(-3,5)∪(5,∞)$
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