Question

1) (a+b)(x - y)
2)(a-b)(x+y)
3)(m-n)(p+q)
4)(a+b)(a+2)

Answer 1

1)(a+b)(x-y)=ax-ay+bx-by
2)(a-b)(x+y)=ax+ay-bx-by
3)(m-n)(p+q)=mp+mq-np-nq
4)(a+b)(a+2)=a²+2a+ba+2b