Log_{2}8 " alt="log2(x^2-x-4)> Log_{2}8 " align="absmiddle" class="latex-formula">
x^2-x-4>8
x^2-x-12>0
D=1-4*1*(-12)=1+48=49
-3 " alt=" x_{1}= \frac{1-7}{2}>-3 " align="absmiddle" class="latex-formula">
4 " alt=" x_{2}= \frac{1+7}{2}>4 " align="absmiddle" class="latex-formula">