(ii)解き方を教えてください 答えは18です。お願いします
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ん
ありがとうございます
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![[急用]教えてください。。
すごく簡単な問題なのですが、、
二次関数の最大最小を求める時、... - 1](https://d16qcfao6gys7e.cloudfront.net/uploads/qa_question_image/file/36867/thumb_l_webp_01471604092814.webp?Expires=1775422837&Signature=dfDOWX1Hyca68e1kZjvLWeyxaRlVZ1N28WplQbAl3w2NMKeh3hE0apEk-SQvwLIRCYwuq22fnj7ndNNEffWhoonXSlP3bYZTcbocyEKnWbaVX7tT3sPrmBL0JlttT-TkE8J5WyDCWWGa19qkGdCmIZKYvQlOmlM6sqFvGnw9~xHrS2yM-JcMJ8WnglTAQqaSDoG7ea0ZpMyBIA1PDCVY9gKTSxapNa5nWwWx5-gLbVhqrJ0ej59VDsRFgmySuo5UD7Feq7rTkT82vzDPE0Znheu2T0CaQPKUI67MRZD2bW0ieiU5cjEyQDL2is9zTN9oSSiP5FLDGsbrdSjY-kWVgg__&Key-Pair-Id=K2PR0GXBPZ19LT&Expires=1775422837&Signature=mSpVbr2RQOM6~9~W-P-M0qYeq4HFgWNW6r32xlwvk3UioLqSx7hMCfwQOWHYwpsiiN~46YlaJj5Lm30KhpUZ3OUDJb~wUGx21S5Cr8HCnY3bzGu6jveo9XEIZzhPzX6LJcmdDpTVWzDqhP5xrTjJSZk2Tg8PYQH3rBkAAXBWJUFkfaE3grD9jDvHSvP2m4SWSUgY5MOPo~oO4octpsj6DRvfkyQc2NlJluS0FC4Jym7pP1h1AkK92vihj8-i~rXPGrdAnPZZN4ISH-WAjYuTcPdJeOBvYutoI3xbN1fJJz-gpSNCCZ0WHOZr6QwspgEdX8n2LuEgSqDSXHfGSfE0Sw__&Key-Pair-Id=K2PR0GXBPZ19LT)
ありがとうございます