$x^2-6x+8\ge0$
$x^2-9x+14<0$
$4x^2-25\le0$
$x^2+2x+1\ge0$
$x^2-2x+5\geq 0$
$x^2-25\ge0$
$x^2+11x<-18$
Logarithm expansion consists of applying the properties of logarithms to express a single logarithm in multiple logarithms, usually much simpler.
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