Mathematics
Senior High
α²-β²を解くのにどうして回答のような出だしの書き方になるのですか??解説お願いします🙏
81
(3) (a-B)² = (a + B)²-4aß
2
2
1
-()'-+----+
-4
3
よって
したがって
3
a-B = ±
=
α²-B² = (a +B)(a-B)
3
-
土
9
2√2
3
8
-i
9
=
+1
2√ 2 i
3
=土
42
9
i
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