Describe how to solve 81m^2-25

We can solve if it is equal to zero (it could be equalt to 12031923 for all we know)

I can say how to factor though

difference of 2 perfect squares

if yo have

a^2-b^2 then that equals (a-b) (a+b)

81m^2 = (9m) ^2

25=5^2

tehrfor

(9m) ^2 - (5) ^2 = (9m-5) (9m+5)