let $f(x)=-2x^{4}ln x$ $f(x)=$ $f(e^{3})=$

$let $f(x)=-2x^{4}ln x$ $f(x)=$ $f(e^{3})=$$

let
$f(x)=-2x^{4}ln x$
$f(x)=$
$f(e^{3})=$

Mathematics: Calculus
$ f'(x) = -8x^{3}\ln x - 2x^{3} $
$ f'(e^{3}) = -8e^{9}\cdot3 - 2e^{9} = -26e^{9} $