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2298d
@2298d
August 2022
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Решите неравенство пожалуйста срочно
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sangers1959
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Log₃(8x²+x)>2+log₃(x²)+log₃(x) ОДЗ: x>0 x>-1/8 ⇒ x∈(0;+∞)
log₃(8x²+x)>log₃9+log₃(x²*x)
log₃(8x²+x)>log₃(9x³)
8x²+x>9x³
9x³-8x²-x<0
x(9x²-8x-1)<0
Находим нулевые точки:
x₁=0
9x²-8x-1=0 D=100
x₂=1 x₃=-1/9 ⇒
x(x+1/9)(x-1)<0
-∞_____+______-1/9_____+______0_____-______1______+______+∞
x∈(-∞;-1/9)U(0;1)
Соглосно ОДЗ: x∈(0;+∞) ⇒
Ответ: x∈(0;1).
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Answers & Comments
Verified answer
Log₃(8x²+x)>2+log₃(x²)+log₃(x) ОДЗ: x>0 x>-1/8 ⇒ x∈(0;+∞)log₃(8x²+x)>log₃9+log₃(x²*x)
log₃(8x²+x)>log₃(9x³)
8x²+x>9x³
9x³-8x²-x<0
x(9x²-8x-1)<0
Находим нулевые точки:
x₁=0
9x²-8x-1=0 D=100
x₂=1 x₃=-1/9 ⇒
x(x+1/9)(x-1)<0
-∞_____+______-1/9_____+______0_____-______1______+______+∞
x∈(-∞;-1/9)U(0;1)
Соглосно ОДЗ: x∈(0;+∞) ⇒
Ответ: x∈(0;1).