Question 1090159
Denominators cannot equal zero so,
{{{a+1=0}}}
{{{a=-1}}}
and
{{{a^2+5a+6=(a+2)(a+3)}}}
{{{a+2=0}}}
{{{a=-2}}}
and
{{{a+3=0}}}
{{{a=-3}}}
These are all restricted values.
{{{a<>-1}}}
{{{a<>-2}}}
{{{a<>-3}}}