Question 810575
{{{log(5,(r+2))+log(5,(r-2))=1}}}
{{{log(5,((r+2)(r-2)))=1}}}


exponentiate 
{{{log(a,c)=b}}}
{{{a^b=c}}}



{{{5^1=(r+2)(r-2)}}}
{{{5=r^2-4}}}
{{{r^2=9}}}
{{{sqrt(r^2)=sqrt(9)}}}
{{{r= +- 3 }}}