Mathematics
Senior High
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7 2次関数y=ax²-4x+α-3において, y の値が常に正であるように,定数aの値の範
囲を定めよ。
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![基本例題の[2]についてです。ここの条件ですが、
a/3<=1<=4a/3とありますが4a... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810404/thumb_l_webp_70236300-B387-4A8D-A246-76C58E626EEE.webp?Expires=1787718072&Signature=V~WLzJnjbxabDAurmwwFZaRUJ6c1ufFsuCFcGtA1dtZJwpQkM-W7lsuRnwEgebThazyt7I0hjYj8coVlBdKrcH~FcZ35MvYrTRoQ0frTqsE5ZoEmpygZgF~GkcOX7TsDoZ8s9xIWe0pecdN8fPzzyu9rshudLqhsPpCKuNvOtqvk10AJLTV3ovV~9fom2ej~l1TYv09EcVR-Cq4yFiMMnP24YlxE8J~3j-mf1mKY2QBji2w41QYsgwVaBPuQSot4lIHlsNrZru~6WiD6wQJ2rHrnCKEDhjFyi72k7Fy-PNH1BLNGShXUepkoOsxTedyV905JC52V2qjhc7htw2ELIw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787718072&Signature=rTRMDcidISWrcN7Qmo65om5Ff7FMSoqVu3WiTbdrQb7MLDQcL7MUhUYqKaBo3k5WgDRHJGbv2jrWMcda1Cc8G6hL8m1ZBlkPCOUkC2wBBRd3t4bVlHMAWWeG-Rvt~Gk8TwDU0lPHGv-3iviNpppZc5Vbsrphlyfp9~6WQRizKGhCGBB0yz-558rZoyhxyrdV1VzbWKZ4hOwi-riGM0d-jwyhFfoHGtY8gm2ys066GB2LW1nuYq7m~ZB390PcRtcW10OeEbw8f-T~i42ff4MUtnh9W-iNQTz5-w6GM0NRJc~5-ncvWXqIvhclc1jQE90mF-VtVq3guMjwSUmz0aCd-w__&Key-Pair-Id=K2W722D70GJS8W)
a<0のときグラフ的に不可能って書いてありますが、なぜですか？