Answer
$(m-1)^2$.
Work Step by Step
The given polynomial is
$=m^2-2m+1$
Write the the polynomial as $a^2-2ab+b^2$.
$=m^2-2(m)(1)+1^2$.
Use perfect square trinomial pattern
$a^2-2ab+b^2=(a-b)^2$.
We have $a=m$ and $b=1$.
$=(m-1)^2$.
Hence, the factor of the given polynomial is $(m-1)^2$.
