Question

упростите выражение (m-3)(m+3)-m(m+2)

Answer 1

(m-3)(m+3)-m(m+2) = m² -9 -m² -2m = -9-2m

Answer 2

m^2+ 3m-3m- 9-m^2- 2m
-9=-3m+3m-2m
-9=2m