tolong di bantu y suhu,nomor 2-4

2. a. ( -3m + 4n - 6 ) + ( 7n - 8m + 10 )
= -3m + 4n - 6 + 7n - 8m + 10
= -3m - 8m + 4n + 7n - 6 + 10
= -11m + 11n + 4
b. ( 15a + 7b - 5c ) + ( -11a - 12b + 13d )
= 15a + 7b - 5c - 11a - 12b + 13d
= 15a - 11a + 7b - 12b - 5c + 13d
= 4a - 5b - 5c + 13d

3. a. ( -3m + 4n - 6 ) - ( 7n - 8m + 10 )
= -3m + 4n - 6 - 7n + 8m - 10
= 5m -3n -16
b. ( 15a + 7b - 5c ) - ( 11a - 12b + 13d )
= 15a + 7b - 5c - 11a + 12b - 13d
= 4a + 19b - 5c - 13d

4. 5x - 6y + 8z + ( 7x - 9z ) - ( 2y + 9z - 10 )
= 5x + 7x - 6y - 2y + 8z - 9z - 9z - 10
= 12x - 8y - 10z -10

SEMOGA BERMANFAAT ✌✌