Kak tolong jawab sama caranya.. Makasih

    12       3 - √6      12(3 - √6)
--------- x --------- = ---------------
3 + √6     3 - √6     3x3 - √6(√6)
       
                              12 (3 - √6)
                           = ---------------
                                 9 - 6

                           = 12/3 (3 - √6)
                           = 4 (3 - √6)
                           = 12 - 4√6