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Vetta1605
@Vetta1605
July 2022
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ПОМОГИТЕ РЕШИТЬ 9 НОМЕР! ОЧЕНЬ СРОЧНО! 50 БАЛЛОВ!
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Log^2(2x+3) +2log^2(x) <= 3log(2x+3)*log(x) | x, 2x+3 > 0
log^2(2x+3) - 3log(2x+3)log(x) + 2log^2(x) <= 0
[log(2x+3) - log(x)]*[log(2x+3) - 2log(x)] <= 0
a)
log(2x+3) - log(x) <= 0, log(2x+3) - 2log(x) >= 0
2x + 3 <= x, 2x + 3 >= x^2
x <= -3 - нет решений
b)
log(2x+3) - log(x) >= 0, log(2x+3) - 2log(x) <= 0
2x+3 >= x, 2x+3 <= x^2
x >= -3
x^2 - 2x - 3 >= 0
(x - 3)(x + 1) >= 0
x <= -1 U x >= 3
x >= 3
Ответ: x >= 3
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Answers & Comments
log^2(2x+3) - 3log(2x+3)log(x) + 2log^2(x) <= 0
[log(2x+3) - log(x)]*[log(2x+3) - 2log(x)] <= 0
a)
log(2x+3) - log(x) <= 0, log(2x+3) - 2log(x) >= 0
2x + 3 <= x, 2x + 3 >= x^2
x <= -3 - нет решений
b)
log(2x+3) - log(x) >= 0, log(2x+3) - 2log(x) <= 0
2x+3 >= x, 2x+3 <= x^2
x >= -3
x^2 - 2x - 3 >= 0
(x - 3)(x + 1) >= 0
x <= -1 U x >= 3
x >= 3
Ответ: x >= 3