1*(m + 75/4)*(m - 75/4)
(1*(m + 75/4))*(m - 75/4)
(-75 + 4*m)*(75 + 4*m)
----------------------
25
(-75 + 4*m)*(75 + 4*m)/25
2
-5625 + 16*m
-------------
25
(-5625 + 16*m^2)/25
2
-5625 + 16*m
-------------
25
(-5625 + 16*m^2)/25