Answer:
5 x^2 + 2y^2 + 12x + 5y
Step-by-step explanation:
6x + 2y +y^2 + 6x + 2y + y^2 + 4x^2 + x^2 + y
12x +y^2 + 4y + y^2 + 4x^2 + x^2 + y
12x + 2y^2 + 4x^2 + x^2 + 5y
2y^2 + 5x^2 + 12x + 5y
