Algebra
posted by Janice .
Simplify by removing factors of 1.
m^2  9/(m+3)^2

Do you mean (m^29)/(m+3)^2 ?
If so, you should have had parentheses for the numerator.
That can be written
(m+3)(m3)/[(m+3)(m+3)]
Cancel out the m+3 terms for a simplified version.