= 4a2 + 2ab 2b2
It is 2a-b simplified
4a + 3c - 2b - c + a - b = 5a - 3b + 2c
a+a+a+a+b+b - add the like terms
4a and 2b cannot be added because they are not like terms.
10a - 10 b
It is: b+4 when simplified