Algebra 2 help please!! 2 questions!!

1st question:

The first blank is the factored out form of $(x^2 - y^2)^2$, which is $x^4 -2x^{2}y^2 + y^4$.

The second blank is achieved by combining like terms. $2x^4 - 2x^{2}y^2 + 2y^2$.

The third blank is just factoring $2x^4 - 2x^{2}y^2 + 2y^2$ into $2(x^4 - x^{2}y^2 + y^2)$ by taking out $2$. 

I solved the second one 1 day ago...

1) Distributive Prop

2) Division Prop of =

3) Multipliation Prop of =

Hope this helps,

- PM