Add or subtract.

(m? - m - 3) + (m-4)

A. m^2 + m-1

B. m^2 + 2m - 7

C. m^2-7

D. m^2 - 1

C.

Step-by-step explanation:

(m^2-m-3) + (m-4)

there is no like terms for m^2 so it stays the stay.

next you add - m to m because the first m is negative they cancel out leaving nothing. lastly we add - 4+-3 these added together give you - 7.

so you are left with m^2 + 0 - 7

which simplifies to m^2 - 7