Respuesta :

lizajohn144466666
You have to add like terms
5x^2 -8xy+15y^2

Answer:

5x²- 8xy + y²

Step-by-step explanation:

combine same terms

(x² +4x²) + (-3xy - 5xy) + (-7y² + 8y²)

=5x² - 8xy + y²