Question

multiply
1-x+y by 1+x+y​

Answer 1

Answer:

I hope it will help u friend

1-x+y by 1+x+y

1+x+y+x+y

Answer is 1+2y

Take Care

Answer 2

Answer  

$1 - 2y -x^{2}+y^{2}$

Step-by-step explanation:

$(1-x+y)(1+x+y)\\1+x+y-x-x^{2}-xy+y+yx+y^{2}\\1+2y-x^{2}+y^{2}$