Rasionalkan bentuk akar berikut : a. 5 / √a-2√b b. 3-√2 / 3+√2

           5            √a + 2√b             5 (√a + 2√b)
a)  -----------  x  ------------  =  -----------------------------
      √a - 2√b      √a + 2√b       √a (√a )  -  2√b (2√b)

                                                     5 ( √a  +  2√b )
                                          =   ----------------------------
                                                        a  -  4b


      3 - √2        3 - √2          3 (3)  - 3√2 - 3√2 +  √2 (√2)
b) -----------  x  ---------   =   -------------------------------------
      3 + √2        3 - √2                   3 (3)  - √2 (√2)

                                           9  -  6√2  + 2
                                     =  --------------------
                                              9  -  2

                                           11  -  6√2
                                     =  ---------------
                                               7

                                      =  11/7  - 6/7 √2