11.04.2022

Алгебра 15 баллов . СРОЧНО
Решите уравнение : ( 7x+1) ( x-3 ) +20 ( x-1) ( x+1)=3(3x-2) в квадрате + 13

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Раскроем скобки: 7x^2 — 21x+x-3+20x^2-20=27x^2 — 36x+12+13;

16x=48; x=3

Ответ. 3

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