Question

1)x+xy+a+ay
2)kt+t-2k-2
3)am+an+4m+4n
4)4+2m+2n+mn
5)ab+ac+7b+7c
6)xz+yz-3x-3y

Answer 1

1. =х*(1+у)+а*(1+у)=(1+у)*(х+а)
2. =t*(k+1)-2(k+1)=(k+1)*(t-2)