A IIR filter is defined by the difference equation

$$

Y$[$n$]=-0\mathrm{.}8$y$[$n$-2]+0\mathrm{.}8$x$[$n$]+$ x$[$n$-1]$

$$

$1)$ Find and Write H$($z$)$ on paper

$2)$ Write down Poles and Zeroes and indicate stability

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