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Cubic Equation Root Sum

Let $ r, $ $ s, $ and $ t $ be the roots of the equation $ 4x^3 - 59x^2 + 32x - 32 = 0 $. Find the value of $ f(r) + f(s) + f(t) $, where $ f(x) = 4x^3 - 59x^2 $.

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+
4
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-
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9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$