Submit the algorithm in pseudocode

$($

or any computer language

$)$

$$minimize vector x using gradient

$-$

based optimization: f

$($

x

$)$

$=$

$0\mathrm{.}5*||$

A

$*$

$$x

$$

$$b

$||$

$^$

$2$

$,$

$$where A

$,$

$$x

$,$

$$and b are some vectors.