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S7raphim
@S7raphim
August 2022
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Используя график функции y=x²-2x-8, найдите решение неравенства x²-2x-8≤0
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jsiskwnedjxin
Х^2 - 2х - 8 = 0
a = 1, b = -2, c = -8
D = b^2 - 4ac
D = 4 - (-32) = 36, корень из D = 6
х1 = -b + корень из D
2a
х2 = -b - корень из D
2a
x1 = 2 + 6 / 2 = 4
x2 = 2 - 6 / 2 = -2
10 votes
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Answers & Comments
a = 1, b = -2, c = -8
D = b^2 - 4ac
D = 4 - (-32) = 36, корень из D = 6
х1 = -b + корень из D
2a
х2 = -b - корень из D
2a
x1 = 2 + 6 / 2 = 4
x2 = 2 - 6 / 2 = -2