ПОМОГИТЕ) фигня-бан)
[tex] log_{2}^2 2x -6log_{2} 4x + 14 \leq 0[/tex]
Заранее спасибо)
[tex] log_{2}^2 2x -6log_{2} 4x + 14 \leq 0[/tex]
Заранее спасибо)
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Answers & Comments
log2^2 (2x) -6log2(2x)+8≤0
log2 (2x)=t
t²-6t+8≤0
D=36-32=4=2^2
t1=6+2/2=8/2=4
t2=6-2/2=4/2=2
log 2 (2x) = 4
2x=2^4
2x=16
x1=8
log2 (2x)= 2
2x=2^2
2x=4
x2=2
≤0
[2;8]