Answer
$5n^2-4n+1$
Work Step by Step
Given: $(25n^3-11n+4) \div (5n+4)$
Apply long division method.
Thus, $\dfrac{25n^3-11n+4}{(5n+4)}=\dfrac{25n^3}{(5n+4)}-\dfrac{11n}{(5n+4)}+\dfrac{4}{(5n+4)}$
$=\dfrac{25n^3}{(5n+4)}-\dfrac{11n}{(5n+4)}+\dfrac{4}{(5n+4)}$
$=5n^2-4n+1$