[tex](\sqrt{5}-1)^2+\sqrt{20}=(\sqrt{5})^2-2*\sqrt{5}*1+1^2+\sqrt{4}*\sqrt{5}=5-2\sqrt{5}+1+2\sqrt{5}= 6[/tex]
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[tex](\sqrt{5}-1)^2+\sqrt{20}=(\sqrt{5})^2-2*\sqrt{5}*1+1^2+\sqrt{4}*\sqrt{5}=5-2\sqrt{5}+1+2\sqrt{5}= 6[/tex]