Question 945674
Each coefficient has a factor of 3.


{{{3(3m^2-20m+25)}}}


From there you can make trials of different combinations, or check Discriminant.
...The discriminant is 100, a perfect square.  This indicates that the quadratic factor should be factorable.


(3m____5)(m_____5)
This should work if both constant terms are negative or "subtracted".
{{{3m^2-20m+25=(3m-5)(m-5)}}}