Question 927218

{{{-p^2+6p-9}}}

{{{-(p^2-6p+3^2)}}}

{{{-(p-3)^2}}}



{{{-144+9n^2}}}

{{{9n^2-144}}}

{{{(3n)^2-12^2}}}

{{{(3n+12)(3n-12)}}}