First Box x^4 + 2 x^2 y^2 + y^4
Middle box (add like terms) 2x^4 + 2 x^2 y^2 + 2 y^4
Last box: (factor out the 2) 2 (x^4 + x^2 y^2 + y^4 )
First Box x^4 + 2 x^2 y^2 + y^4
Middle box (add like terms) 2x^4 + 2 x^2 y^2 + 2 y^4
Last box: (factor out the 2) 2 (x^4 + x^2 y^2 + y^4 )