(a+3)7 a(a+b) (x-y)10 (a+b-c)2 a(x-y) (a-b)(-6)

Question

(a+3)7 a(a+b) (x-y)10 (a+b-c)2 a(x-y) (a-b)(-6)

Answer 1

1). 7a+21
2) a^2+ab
3) 10x-10y
4)2a+2b-2c
5)ax-ay
6) -6a-6b