Предмет: Алгебра, автор: qwdqwdqwdqwd

даю 35 баллов алгебра

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Автор ответа: Tanda80

0

$21t^2-(7t-3)(3t+1)=-2\\21t^2-(21t^2+7t-9t-3)=-2\\21t^2-21t^2-7t+9t+3=-2\\2t=-2-3\\2t=-5\\t=-5:2\\t=-2,5$

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