4x^2+a^2+1+4ax-2a-4x☜(a+b+c)^2の公式を利用
=4x^2+(4a-4)x+(a^2-2a+1)
=4x^2+(4a-4)+(a-1)^2
だと思います！間違えていたらすみません🙇🏼♀️
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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=1787752280&Signature=KZE0Za5Bj6bwdWehzXXVZRMlYOCbf16N~FXTOdSPhWFkcUHKl36SfWXxUI~5wpiqVBEewx7nLEoWWzDmG~y31lYm4h4K5j6otrQhgsLt-U3aXs1EUFV3PI3b5ELRb5-zxHwXzOmpyZn7UFk6qTghFIN7QOXy47G~Oc9mmeVKfXgWqYtjMhzHp7BnqJiVVjpqhYHjT5OA2kbAxSUsBj7uCE4eXRC1ZEwmV~dbbuaRzDhm2chg7-ASgSlEgCLwrYXqwWfiIbmQVQB9-njj606zW-X9b-9UwO9YMXvPnH8d4VLx5jDuz1MvwJlBYq7HxC8HrvnnRHxn0RfEaNF94~WKgQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787752280&Signature=AFFWa8B2Z0GkU78mAs2q2cWeiUcOqfestRxHVT-aKTUAEHLTx3ILeu9M3lqjFEXW-mVnXYQGu~21YTs-1awsXdJ1ECzXCEk89Mhy4wij247wTjRnsfZGo5Gzi5ALSVynKg4mADavPPtcKXPcJOb-mgiXP1MkhNECMkkLApkadECR3a2peYmtNiTxqcq8YBH89EpSwvMymlNTy7~1-XNlN4JofmD1tFmYPVRqJ3p3Nj0jFGrx-JhOWV2eL~LUAXCE~a48IlhfGXgLuB6bBMCZhp~m4ZNEudCbqekvKwlFVyLmehzDG~firmjIN8edTeCPTZjCguhVQMMDLop~difKZA__&Key-Pair-Id=K2W722D70GJS8W)
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ありがとうございます！