(m^2-m-4)+(m-5)
m^2-2m+9
m^2+2m-9
m^2-2m-9* my answer
m^2-9
When you have a negative sign preceding parentheses, do an extra step to remove the parentheses:
(m^2-m-4)+(m-5)
=m^2-m-4+m-5
=m^2-m+m-4-5
=m^2-9
m^2-2m+9
m^2+2m-9
m^2-2m-9* my answer
m^2-9
(m^2-m-4)+(m-5)
=m^2-m-4+m-5
=m^2-m+m-4-5
=m^2-9