Answer
$2x^2+2x+8+\dfrac{28}{x-4}$
Work Step by Step
Using the long division below, then
\begin{array}{l}\require{cancel}(
2x^3-6x^2-4
)\div(
x-4
)\\=
2x^2+2x+8+\dfrac{28}{x-4}
.\end{array}
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