数学Ⅰ青チャートの解の条件の問題です！ この解答の[2]のf(-1)f(1)<0になるのがよく分かりません… 分かる方ぜひわかりやすくお願いします！！！
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![数学Ⅰ青チャートの解の条件の問題です！
この解答の[2]のf(-1)f(1)<0になるのが... - 1](https://d16qcfao6gys7e.cloudfront.net/uploads/qa_question_image/file/26288/thumb_l_webp_8AEAEA05-0CBB-43CA-A5EE-92BBA0C991D9.webp?Expires=1786089970&Signature=FZMOBI~zEfBVqukBheygrGDl1vbI8q8NM~0AhFc40ozZr2IwDssQMo915W7ZKVM~stDHXJ6~~iRP0vbVrMp93pOCC1qYxTSfvrubB~BiMLtAohCxhc~3EROE8wYvFp~2wHyBhwLrf90mq7IfinYXzAehFiPnuMjcreMO-~hnE1rAX2jTynFP-j97pu4Tzbcw808A29KEf4piAo6nAqUM5JdNf200sJ9sWWsnTvBjbHasli-UsiWc3gbBdMi3BeGqHHQQx3j28-TWjvb3DS-JZpNx3iongC9AHibv0As7F0hHymrraEP6vgIjl4fp0qRUrXnva3AMSHA74xAw8sEUgQ__&Key-Pair-Id=K2PR0GXBPZ19LT&Expires=1786089970&Signature=A9TWTbbz8Oa0I9DKa-BjB6ku4bsYWLmmCAcxHrgjhkIoUEWNOLabcB7jcLbiRdmuzkQbTGaw6k~6fUDNr56YS6~KcTLgqeOuX-t3p0PGCMAxaYGx6gffg6Eq7pn7~D3MQ~Le8gdqe7jc0wRD8AsLXqvhIE2vgSMuyu75VGYUQvMdDHN39Q7uiP9A-qA1gxOq~wnRlc7eghvL7iFXkIyy1GT7yQO14DRlgKHGN9qdJj8~SC9vf9eAjrkfTMuY6RVCFe4t0zgkuSdORntOaSlsbqIBjeXRkIRJYLqCRnhGygYsSlU54FXgUbbr54-sVycy0yabdbQ2jV-ReXSS9IOxbg__&Key-Pair-Id=K2PR0GXBPZ19LT)
