Question

(5x^2+xy-3y^2)+(-9x^2+3xy+5y^2)

Answer 1

Let's simplify the expression:

`\begin{gathered} (5x^2+xy-3y^2)+(-9x^2+3xy+5y^2)=5x^2+xy-3y^2-9x^2+3xy+5y^2 \\ =-4x^2+4xy+2y^2 \end{gathered}`

Therefore, the simplified expression is:

`-4x^2+4xy-2y^2`