Page 102 - MarceAlgebra Demystified
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CHAPTER 5 Exponents and Roots                                                 89


                          a    a
                            n   n
            Property 8       ¼
                          b    b n
            Property 8 says that we can take the quotient first then the power or each
            power followed by the quotient.



                 Examples

                     3                             4
                                   3                   4
                   2    2 2 2     2     8       x     x
                      ¼     ¼       ¼               ¼
                   5    5 5 5     5 3  125      y     y 4
                  !   4    2 4    8
                    2
                   x     ðx Þ    x
                       ¼      ¼
                           5 4
                   y 5    ðy Þ   y 20
                      n       ð 1ÞðnÞ  "     1  # n      n
                                                  y
                   x       x            x            n  y
                       ¼           ¼           ¼     ¼
                   y       y            y         x     x n
                 This example will be used for the rest of the examples and practice
                 problems.

                      2                          3
                   2      3   9               1     2    8
                           2                          3
                       ¼    ¼                     ¼    ¼   ¼ 8
                   3      2 2  4              2     1 3  1
                                                                    5
                           3                           5          3
                   6x þ 5      ðx   1Þ          1          ð x þ 2Þ          15
                                      3
                            ¼                           ¼            ¼ðx þ 2Þ
                   x   1       ð6x þ 5Þ 3    ðx þ 2Þ 3        1 5
                        6
                      !        4 6     24   1                    18    18
                     3
                   y        ðx Þ    x      x 24  1     1    1   y    y
                          ¼       ¼      ¼    ¼          ¼         ¼
                               3 6
                   x  4     ðy Þ    y  18   1   x 24  y 18  x 24  1  x 24
                                           y 18
                 This expression can be simplified more quickly using Property 8 and
                 Property 3.
                      !  6         6
                     3          3      ð 3Þð 6Þ  18
                   y         y        y         y
                                   ¼          ¼
                   x  4   ¼   x  4     6  x ð 4Þð 6Þ  x 24
                             4
                          !
                          3           2 4         8
                   ðx þ 7Þ         ðx Þ         x
                               ¼           ¼
                     x  2               3    4  ðx þ 7Þ 12
                                  ðx þ 7Þ
                                         1       1      1           1
                               ¼ x  8         ¼              ¼
                                                                8
                                      ðx þ 7Þ 12  x 8  ðx þ 7Þ 12  x ðx þ 7Þ 12
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