Mathematics
Junior High
(写真参照)x=√5+√2、Y=√5-√2のとき
x2乗-Y2乗=4√10
どうしても分かりません、どなたか教えて頂けると幸いです。
よろしくお願いします！
Answers
x"-y"=(√5+√2)"-(√5-√2)"
=(5+2√10+2)-(5-2√10+2)
=(7+2√10)-(7-2√10)
=7+2√10-7+2√10
4√10
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