Question

5 question very important ​

Answer 1

(2x²-y²+9)-(x²-3y²)+(x²+2xy-y²)

2x²-y²+9-x²+3y²+x²+2xy-y²

(2x²-x²+x²)+(3y²-y²-y²)+(9)+(2xy)

2x²+y²+9+2xy

2x²+y²+2xy+9