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Anastasiya4545
@Anastasiya4545
October 2021
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7x"2+9x+12 решите дискриминант
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Akula17
7х^2 + 9x + 12 = 0
D = 81 - 4 * 7 * 12 = 81 - 336 = - 255
Дискриминант < 0 (т.е отрицательный)
Корней нет.
-------------------------------------------------
7х^2 + 9x + 2 = 0
D = 81 - 4 * 7 * 2 = 81 - 56 = 25; YD = 5
x1 =(- 9 + 5) / 14 = - 4/14 = - 2/7
x2 = (-9 -5) / 14 = - 1
x1 = - 2/7;
x2 = - 1
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Anastasiya4545
7x"2+9x+2
Anastasiya4545
извиняюсь)))
кляча
Verified answer
D=b^2 - 4ac = 9^2 - 4*7*12=81 - 336= - 255
D<0 Нет корней
Ответ:нет корней
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Anastasiya4545
7x"2+9x+2
извиняюсь)))
кляча
СМОТРИ МОЙ ОТВЕТ. ВТОРОЕ УРАВНЕНИЕ РАСПИСАНО ТАМ.
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Answers & Comments
D = 81 - 4 * 7 * 12 = 81 - 336 = - 255
Дискриминант < 0 (т.е отрицательный)
Корней нет.
-------------------------------------------------
7х^2 + 9x + 2 = 0
D = 81 - 4 * 7 * 2 = 81 - 56 = 25; YD = 5
x1 =(- 9 + 5) / 14 = - 4/14 = - 2/7
x2 = (-9 -5) / 14 = - 1
x1 = - 2/7;
x2 = - 1
Verified answer
D=b^2 - 4ac = 9^2 - 4*7*12=81 - 336= - 255D<0 Нет корней
Ответ:нет корней
извиняюсь)))