Giúp mk vs mk cần gấpppppp

`(3\sqrt{3}-\sqrt{3}+2)(3\sqrt{3}+\sqrt{3}-2)`

=`(2\sqrt{3}+2)(4\sqrt{3}-2)`

`=4(\sqrt{3}+1)(2\sqrt{3}-1)`

`=4(2.\sqrt{9}-\sqrt{3}+2\sqrt{3}-1)`

`=4(6+\sqrt{3}-1)`

`=4(5+\sqrt{3})`

`=20+4\sqrt{3}`