(a-4)をＡと置くと
Ａ²-Ａ-12
＝(Ａ-4)(Ａ+3)
＝(a-8)(a-I)
２ｘ+7をＡ
ｘ-3をBと置くと
Ａ²-B²
＝(Ａ-B)(Ａ+B)
＝(２ｘ+7-(ｘ-3))(２ｘ+7+ｘ-3)
＝(ｘ+10)(３ｘ+4)
間違えてたらすいません😅
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丁寧な解説ありがとうございました😂✨