Question

please solve question 9 please

Answer 1

$3 {x}^{2} + 9 {y}^{2} + 3xy..........(1) \\ 10 {x }^{2} + 2 {y}^{2} - 8xy.........(2) \\ 7 {x }^{2} - 7 {y }^{2} - 11xy....ans$
is this correct