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ladylisafor34
@ladylisafor34
June 2022
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Помогите пожалуйста решить!!! Хотя бы несколько!
2^x-3=16
(1/2)^x+5=4
log2(3x-2)=log8 64
log1/4(2x+5)=-2
log9(x^2-5x-8)=log9(4-6x)
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sangers1959
Verified answer
2^(x-3)=16
2^(x-3)=2^4
x-3=4
x=7.
(1/2)^(x+5)=4
(1/2)^(x+5)=(1/2)^(-2)
x+5=-2
x=-7.
log₂(3x-2)=log₈64
log₂(3x-2)=2¹
3x-2=1
3x=3
x=1.
log₁/₄(2x+5)=-2
log₁/₄(2x+5)=log₁/₄16
2x+5=16
2x=11
x=5,5
log₉(x²-5x-8)=log₉(4-6x)
ОДЗ: x²-5x-8>0 D=57 x₁≈-1,3 x₂≈6,3 x∈(-∞-1,3)U(6,3;+∞)
4-6x>0 6x<4 x<2/3 ⇒ x∈(-∞;-1,3)
x²-5x-8=4-6x
x²+x-12=0 D=49
x₁=3 x₁∉ x₂=-4
Ответ: х=-4.
1 votes
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ladylisafor34
Спасибо большое!!!
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Answers & Comments
Verified answer
2^(x-3)=162^(x-3)=2^4
x-3=4
x=7.
(1/2)^(x+5)=4
(1/2)^(x+5)=(1/2)^(-2)
x+5=-2
x=-7.
log₂(3x-2)=log₈64
log₂(3x-2)=2¹
3x-2=1
3x=3
x=1.
log₁/₄(2x+5)=-2
log₁/₄(2x+5)=log₁/₄16
2x+5=16
2x=11
x=5,5
log₉(x²-5x-8)=log₉(4-6x)
ОДЗ: x²-5x-8>0 D=57 x₁≈-1,3 x₂≈6,3 x∈(-∞-1,3)U(6,3;+∞)
4-6x>0 6x<4 x<2/3 ⇒ x∈(-∞;-1,3)
x²-5x-8=4-6x
x²+x-12=0 D=49
x₁=3 x₁∉ x₂=-4
Ответ: х=-4.