Участники команды пожали руки другой команде, и в итоге получилось 156 рукопожатий. Сколько

Участники команды пожали руки другой команде, и в итоге получилось 156 рукопожатий. Сколько всего людей было?
решила с помощью квадратного уравнения:
х(х-1)/2 = 156
х(2)-х=312
х(2)-х-312=0
Д: 1+4*312= 1249
так как из кв. корня выходит иррациональное число, ответы не удовлетворяют задание. в чем ошибка ?
- Предмет:
  Алгебра
- Автор:
  elijah621
- 6 лет назад

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но я думая 1249 вроде так
- Автор:
  taniyah
- 6 лет назад
- 0
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