Question

please solve a notebook please please​

Answer 1

Answer:

-2x²+2xy+y²

Step-by-step explanation:

Answer 2

Step-by-step explanation:

$- 10 {x}^{2} + 5xy - 6 {y }^{2} \\ + 8 {x}^{2} - 3xy + 7 {y}^{2} \\ - - - - - - - - - \\ - 2 {x}^{2} + 2xy + {y}^{2} \\ - - - - - - - - - -$

Here is your answer!!