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NikisXD100
@NikisXD100
July 2022
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lg (x^2-5x-9) - lg (2x-1) = 0
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Gerren
lg(x^2-5x-9) - lg (2x-1) = 0
Lg (x^2-5x-9) =lg (2x-1)
x^2-5x-9=2x-1
x^2-7x-8=0
x1=-1 искл, 2*(-1)-1=-2-1=-3<0
x2=8
ответ 8
3 votes
Thanks 2
mikael2
Lg(x²-5x-9)=lg(2x-1)
x²-5x-9=2x-1
x²-7x-8=0 по т. Виета x1=8 x2=-1
x=8 x²-5x-9=64-40-9>0 x=-1 1+5-9<0 посторонний
x=8 2x-1=16-1=15>0
ответ х=8
1 votes
Thanks 0
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Answers & Comments
Lg (x^2-5x-9) =lg (2x-1)
x^2-5x-9=2x-1
x^2-7x-8=0
x1=-1 искл, 2*(-1)-1=-2-1=-3<0
x2=8
ответ 8
x²-5x-9=2x-1
x²-7x-8=0 по т. Виета x1=8 x2=-1
x=8 x²-5x-9=64-40-9>0 x=-1 1+5-9<0 посторонний
x=8 2x-1=16-1=15>0
ответ х=8