Mathematics
Junior High
Resolved
どうして４の二乗になるのか教えてください
x=√7+2, y=√7-2のときの
式x^2-2xy+y2 の値を求めなさい。
x2-2.xy+y²=(x-y)^
={(√7+2)-(√7-2)} 2
=42
=16
16
Answers
Were you able to resolve your confusion?
Users viewing this question
are also looking at these questions 😉
![11番の[2]教えてください
右のページの所まではいきました、、。 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1809738/thumb_l_webp_E52F6F80-13F0-48BB-BCBC-D5D56B5B4D99.webp?Expires=1786719299&Signature=V7wfzmKvF05928lF3cuDOia8VGHv0HwDvinkoi4TGWsNGkrdH1i63AwOOQKs8W9-d2OWBh-36qsFgmPseZJNlazDOivQ5pNpxkW5PyA2ruLv4DbwfSv932fJEwNyl0bWGRhNcPw0jY7bec7XrXfFvUCAasp~soLy~UG2A10B3POOwiY6RBrqQTu5DkKjPPe-0qeY4eg48bVKui629-vlrfoD~uNV9dRuQgkoc-2xxTnsjSRnLGTrdAqvL8sutvsbrCb~jO-4nQdz9B6PbAzG9bvT1zJem-VuOgoZ9KRftY450kbrneGvdzMDEkmFSlNi6ofEo7wTTGZ13lNghoSZ0w__&Key-Pair-Id=K2W722D70GJS8W&Expires=1786719299&Signature=gP98sGVog06RpxzmuHH1x1aumUjIJycCmpX4-ZilKFp9gd7HhUVCdN-VJCyQMqVCyPlM3O~kalrBdGiYjReuoI8HpRPxPwdLsQIl5SxUunYPV1Urd5RhnmTKXYH5e6BQ1aq54OCR1s-jMxjDx2WcnjpGyDAXYrO0lFKlFsLcsvpDQjHQe3qDpGd2RUbosZfcwSbPYw-Y5UsC3diFwbYnkq2wAnk4ok~70bZSLPI2S-DO2NxFdz8OLbmFeFd79oS-gU9AA7M4MbZHiCC7LXkd8MJQnstIQSGK6Bv6gvzgNw0~v1GJYULHY~MruJBIQWUfAnkR4uGJFxDy8c7dg1o5PQ__&Key-Pair-Id=K2W722D70GJS8W)
なるほど！
ありがとうございます