Ответ:
2a×(3a-5)-(a-3)×(a-7)
6а^2-10a-(а^2-7a-3a+21)
6а^2-10a-(а^2-10a+21)
6а^2-10a - a^2+10a-21
6а^2-а^2-21
5a^2- 21
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Ответ:
2a×(3a-5)-(a-3)×(a-7)
6а^2-10a-(а^2-7a-3a+21)
6а^2-10a-(а^2-10a+21)
6а^2-10a - a^2+10a-21
6а^2-а^2-21
5a^2- 21