1. If $x=\sqrt{3}+1$, then $y=2 x^{5}-4 x^{4}-x^{3}-6 x^{2}$ -6

Translate the text above into English, keeping the original text's line breaks and format, and output the translation result directly.
(Hint, from the known we get $x^{2}-2 x$
$$
-2=0 . y=6 \sqrt{3} \text {. }
$$