Let P = 10x2 - 8y2 + 5xy,
Q = 12xy + 10y2 + 3x2
and R = 8y2 - 3x2 + 4xy
Then, (P - Q) + R =
1
4x2 + 10y2 - 3xy
2
4x2 - 10y2 - 3xy
3
4x2 - 10y2 + 7xy
4
4x2 - 26y2 - 11xy
Let P = 10x2 - 8y2 + 5xy,
Q = 12xy + 10y2 + 3x2
and R = 8y2 - 3x2 + 4xy
Then, (P - Q) + R =