Factorise x² + 2x + 1 - y²

After trying this for ages, I looked at the answer and its

(x + 1 - y)(x + 1 + y)

but I still can't get to that point by myself, can anyone help please

Thanks

- Oct 7th 2009, 12:52 AMOllieRowntreeJust started doing maths again last week, stuck on factorising problem
Factorise x² + 2x + 1 - y²

After trying this for ages, I looked at the answer and its

(x + 1 - y)(x + 1 + y)

but I still can't get to that point by myself, can anyone help please

Thanks - Oct 7th 2009, 01:13 AMGrandad