Question

5+p²-6pq+q² from 4+6p²-5pq-6q²

Answer 1

-1 +5p²+pq-7q²

Hope it helps..

Answer 2

$(4+6p^2-5pq-6q^2) - (5+p^2-6pq+q^2)\\=> 4+6p^2-5pq-6q^2- 5 -p^2+6pq -q^2\\=> -1 +5p^2+pq -7q^2\\\\\huge\pink{Hope\:it\:helps\:you}$