11a+7b-(3b-2a)
2a+5
2a+6b
9a + 3b - 11a - 4b = -2a -b
There are no like terms here.
As written, that's 12a + 18 which factors to 6(2a + 3) a^2 + 11a + 18 = (a + 9)(a + 2)
2a-5
2a² + 6a
Add them together: 2a+5a = 7a
It is 2a-b simplified
2a + 3a + 4 = 5a + 4
9a + 1