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P. 104

@ @YQ@                  @pý†bɾa@                                   @

                     .(3x + 1)2 = −2x                    ()

. 9x 2 + 8x + 1 = 0

                     x = −8 ± 64 − 36
                                   18

                       = −8 ± 28
                                18

                       = −8 ± 2 7
                                18

                       = −4 ± 7
                                9

                     .x2  =  −4 −         7   x1  =  −4  +  7
                                  9                      9
                                                            )
                     . 2x − 1 = 3                        (

                             x

                           2x 2 − 1 = 3x
                     2x2 − 3x − 1 = 0

                     x = 3± 9+8
                                 4

                     = 3 ± 17
                             4

                     .x2  =     3  −      17  x1  =  3+     17
                                     4                   4
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