ok I need help so bad on this question and even this test but the question is

( 9m+6)+(-5m-6) and the answers are
4m+12
14m+12
14m-12
and 4m
please help I am very confused.

1 answer

since a +1 is understood in front of each of the brackets of
( 9m+6)+(-5m-6) , that is, think of it as
1(9m+6) + 1(-5m-6) , just use the distributive property to get

9m + 6 - 5m - 6
= 4m + 0
= 4m