1. 4a+2+2a+6b-1+3b+1=6a+9b+2
2. (a+c-5)²
(k+m)²-6
3.D
4. a) (4a+3)- (2a-4)=4a+3-2a+4=2a+7
b) -y+(5-y)-3=-y+5-y-3=-2y+2=-2(y-2)
c)(4a-2)+(4a+2)= 4a-2+4a+2=8a
5.B
