Mathematics
Senior High
なぜ左辺の（）二乗を外すと右辺の数字は±2になるのですか？±になるのは理解できます。
しょうもない質問ですが教えて欲しいです
24になる?
+2
(y +₂)² = 4
1+2=±2
y=-2±2.
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