Mathematics
Junior High
Resolved
因数分解の問題で
25x²＋10x＋1
=(5x)²＋2×1×5x＋1²
=(5x＋1)²
という答えだったのですが、何故
=(5x)²＋2×1×5x＋1²
=(5x＋1)²
となるのか教えてほしいです。
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