Question

MATH EXPERT!!
Please multiply this thank you

Answer 1

Answer:

-y^4+x^4+2*3^yx^2+3^2y

Step-by-step explanation:

Answer 2

Answer:

• $x^4+3x^2y+3xy^2+9y^2-y^4$

Step-by-step explanation:

• $(x^2+3y+y^2)(x^2+3y-y^2)=$
• $x^4+3yx^2-x^2y^2+3x^2y+9y^2-3y^3+x^2y^2+3y^3-y^4=$
• $x^4+3x^2y+3xy^2+9y^2-y^4$