log2(x^2+6x+1)≤3
=> log2(x^2+6x+1)≤log2(8)
=> x^2+6x+1≤8
=> -7≤x≤1
0 (x-2/x) -1 loga(x-2/x)>loga(1)
=> (x-2/x)>1
=> x2