Предмет: Алгебра, автор: 13246587000

Помогите с решением, пожалуйста!!

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Автор ответа: Suesel

Здравствуй! Т.к. ветви параболы направлены вниз, то A<0 , а значит 3 и 4 отпадает. Т.к. точки пересечения с 0x имеют одинаковый знак, то x1*x2=C/A>0 и т.к. A<0 соответственно C<0.
Получается, что правильный ответ 1.

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