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Quadratic Optimization

For real numbers $ x, $ $ y, $ and $ z, $ find the minimum value of \[2x^2 + 5y^2 + 2z^2 + 4xy - 4yz - 2z - 2x.\]

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$\frac{a}{b}$
.
0
=
%

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

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