Answer
$3x^3+9x^2+2x+6-\dfrac{2}{x-3}$
Work Step by Step
Using the long division method below, then
\begin{array}{l}\require{cancel}
(
3x^4-25x^2-20
)\div(
x-3
)
\\=
3x^3+9x^2+2x+6-\dfrac{2}{x-3}
.\end{array}
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