x²+(6a+2)x+3a+4
=x²+2(3a+1)x+3a+4
=(x+3a+1)²-(3a+1)²+3a+4
=(x+3a+1)²-9a²-3a+3なので頂点は(-3a-1,-9a²-3a+3)ですね
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787304767&Signature=gZrTW6lU871gRyCiPV0XfhaaBNSuf36gTIO0jLJNkqIUWTJZ1eac87tlAlSm~X8Mbvk0MFkH4ar6cFHFWK0lKPqzLFEbNVgDCBjaWdG4TsXPCq~uFN5p-OXm2EBKApe7dZMA3ufgI0SI8mujSGVrGU5ajO6J2W-yM2vC8JVG9jDPEoLOO4uIfopTOqyh0bZ7QU3Q1hjR3tHE~6~82vD~PuTW1RvHku0CsT-wKpA1I~pmLVPryPqB6i5xN1o~f73JzQJ5~5PB7yxLTatAzDoWX6cRYH2rE3XmQDpqlrEd-G~fqtSV5FzYrHLXTJWXwpGC7uICGa~Sdm3EetqnMCc01w__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787304767&Signature=yJTfiBdj0b-UT44h2KrzU9AtEW0R5eNbJo5Or3unjtg~EE336tN4Fmf1PwWjjyxd4hCMctci6Z1q--jIpQ~04VTHpbzORF233DYoP~oP8h~TjhUhvoVUVZ4qxSykNuKFAr3PI6ckRpR0ghiFyfs07XnL2JHLuEOqLeOYDqAfFHWzlhsom9~nA20iiM9wzncPIQctyAOWIRCavrbNaLXBw6gPrxID2OXvmzw1PlxpHwUX1b7rWBYbdb1zNYlMVAvgTtpKQW8l-rVQXRM~8eI~-hmhmJm9POlDJfd9Gxa3DhunX-G9F8lTfZKru1kwp81xtOLd3BHqlYONXvz2urOSyw__&Key-Pair-Id=K2W722D70GJS8W)
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