Предмет: Алгебра, автор: Аноним

(x-4)²-25=0 помогииите!!!

Ответы

Автор ответа: natashareimer00

1

Х^2-8х+16-25=х^2-8х-9 D=64+36=100 x=9;-1

natashareimer00: 18/2=9

natashareimer00: Формула

natashareimer00: Это формула нахождения дискриминанта! D=b^2-4*ac

natashareimer00: Оттуда и 100

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