factoring

did you mean

m ² -2m +1

It is a perfect square if that helps.

goilk:

how to factor m squared minus 5.2 plus 1.0 ???

Maybe you meant

m ² - (5*2) +1

=m ² -10 +1

=m ² -9

=m ² -3 ²

= that is a difference of 2 squares. Can you do it now?