0" alt="x^8 \geq 0
\\\ x^4 \geq 0
\\\
x^8+x^4+10>0" align="absmiddle" class="latex-formula">
0
\\\
a+2>0
\\\
a+6>0
\\\
-\frac{4}{(a+2)(a+6)}<0
\\\
\frac{a+1}{a+2}< \frac{a+5}{a+6}" alt=" \frac{a+1}{a+2}- \frac{a+5}{a+6}= \frac{(a+1)(a+6)-(a+5)(a+2)}{(a+2)(a+6)}=
\\\
=\frac{a^2+a+6a+6-a^2-2a-5a-10}{(a+2)(a+6)}=-\frac{4}{(a+2)(a+6)}
\\\
a>0
\\\
a+2>0
\\\
a+6>0
\\\
-\frac{4}{(a+2)(a+6)}<0
\\\
\frac{a+1}{a+2}< \frac{a+5}{a+6}" align="absmiddle" class="latex-formula">