Respuesta :

Answer: 7y²-x²y+3xy+7x²

Solution:
We only have to multiply the polynmial by minus sign, and this changes the signs of all terms:
-(-7y²+x²y-3xy-7x²)=7y²-x²y+3xy+7x²
brit750
[tex] 7x^{2} +3xy - x^{2} y + 7y^{2} [/tex]
hope this helps!