数式の変形がわかりません。 どのようにすれば良いですか？
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![(3)の問題がわかりません。
[1]では判別式を使っているのに[2][3]では使ってません... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1751417/thumb_l_webp_8072EAD7-8653-48B6-8ADE-62CAA9EEB0DF.webp?Expires=1747735848&Signature=aYSY112f1BDNXwzugPLVYJ1f8OxrnmBYG~14t9SL9t5T9ygm6ALE3sDxU5hzI3SW4yuZ2qQ-y6IWRanaMFNLrjXSoBVoYWk9RvyP9FmpIuC9H4MnohXu2vSV7FMyKFEOfjJFYC-~rH2P1zsvHqam1tHgAN02SNIdhf1elvyMxrA-to1FnSjZmJ7BMBoPaALKhE-Sr0QWiRdGKZ7YdmW~SguwW2Sww2xTRl0KaHgeXZLd0b6pIFl51MxZLBXnCP2Bv7unzY~qsEojaAonZz~vX9VQn5~x8OI8nXIDkppfG1tRdGu56iYGip8QlfmaRs4Vo4TDGvl6Tx0pkmvJ54iMNA__&Key-Pair-Id=K2W722D70GJS8W&Expires=1747735848&Signature=vffvhXLZBTxG8IWMJEIu6l1ZdTkVoJCiuszXx2ECF9IGuk2C1rkIpHO2Zk6wVm5YaaoczsrmBR5iIhpupKkI8EHqZsgzhb24Y5em7GMUI4Qho6g~GjpO9h9GUVp1h~z5W6MR0Not~4WN3isET~4g3xpghwhrpq7kjnTyhaxG3aCrPOt7YYKpSHlt6G5v2aSdqNTVVqHmi4i72PQapsaWTiQM0e3BLLV4PuK47KA47FxdzzZhhgfUss0Ld7AfSQLo0jbFrmsc8zKuuji8vcFJZkEhArZNr~nscYTGjMdJEIbmw8wnopKHwDRB5AjvWpxacNJsSD~eAa6-8Vgg8sXVTA__&Key-Pair-Id=K2W722D70GJS8W)
![(3)の問題がわかりません。
[1]では判別式を使っているのに[2][3]では使ってません... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1751418/thumb_l_webp_C0068A8B-C09A-47C4-BA21-F568E5071D77.webp?Expires=1747735848&Signature=kC2RQCIi4U6WRWANofofcT0b5VijegN9eI4lqEQAw6F1WKP4DIQkzhWWgEIHlGZkdaBh9T4z1tKBqFQv~xV8dqkAsXA6gTE8G1CSLw3YCWwvE5PpQUGAJ03tcj~Ke0pue1cABCu6Lt8~cReu459c6j2b6UVXcGcrKjTPbSh8znaAJNdQD28coO6UfO2xPhzb7qN~CqJYBS2z1vLw6AGayZm~GhS-0eJm-2nFkQTQqgJl-b-fwIM7tNV2PM~OTuwjx~biJaDXJEB59e7QCVu1paUpg2ogOBuEt~5-fMcBqbTG1oHfCTqdAdnCLFjP4b9MYpNxzobz0gbzD7G33PvNsg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1747735848&Signature=nBtdDbgJi~6emz5hxwzIC4fpI2fKAuapCUrcRKIJqmxix-YnukiJ6J7fTdzHmovw0ChsAW5WNEyZdQg6RGasI7juB57t~-P9re4ImYqSjZMySssEW25eov7mjH0YXq7jr18Asgka2W~SXlHTXB7pNwmF71DiG3vDQjxpZzKWsi~cTzn3AmvQotzZqGt75mSsNGKDjOESMghNY1M9Dg5EUrrtGh82bz2Jy1L72baO-7jpTDnI8cdMn1hADD5N7lvn2jsSLef3ZHWHNKdR-kVwSvFt9BU-Iwl2VKpf1W5UFuyhkB3LoCvIOVzh69GizJLOKxjAwjyop~p1cUctwwKg-w__&Key-Pair-Id=K2W722D70GJS8W)
