How do I factor this out? Why does the x-y disappear and the other stays behind? Can anyone explain this to me?

Question

asked Feb 12, 2020 187k views

1 Answer

Mark Ellul · Answer 1 · 2020-02-16T06:09:12+0000

Answer:

because in first expressions they common out x and y and then it get cancel out

Explanation:

See answer in above picture