Question 447729


{{{36m^2-81}}}...look closely, ....you have {{{36m^2}}}...since {{{36=6^2))), you can write {{{36m^2}}} as {{{(6m)^2}}}

you also have {{{81}}}...since {{{81=9^2)))...substitute it in

{{{36m^2-81=(6m)^2-9^2}}}.now, you have the difference of two squares and apply the rule for factoring the difference of two squares

{{{(6m)^2-9^2=(6m-9)(6m+9)}}}