Toloong doong pleaseeeee

a. 4a + 10b - 9a + 12ab
= 4a - 9a + 10b + 12 ab
= -5a + 10b + 12 ab
b. 5p - 6 pq - 7p² + 16pq + 8p
= -7p² + 5p + 8p - 6pq + 16pq
= -7p² + 13p + 10pq
c. 7m² + 8m + 6 - 9m² - 2m + 10
= 7m² - 9m² + 8m - 2m + 6 + 10
= -2m² + 6m + 16
d. 3x²y - 2xy + 7x²y² - 4xy² - 8xy
= 7x²y² + 3x²y - 4xy² -2xy -8xy
= 7x²y² + 3x²y - 4xy² - 10xy
.
semoga membantu :)