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             (2)请用配方法解方程: 3x2-6x-12=0                                                                                                                                                                                                                                                                                                                                                                                                                                                                    通过预习,你对本节课有哪些了解?

自            (3)仔细观察下列变形:y=3x2-6x-12                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

                     ① y=x2-2x-4                                                                                                                                                                                                                                                                                                                                                                                                                                                                        

 
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