Question

18. Remove the parentheses from the following expression, and combine like terms: (a + b – c) + 3a – 2c

A. 4a + b + 3c
B. 4a + b – 3c
C. 2a – b – c
D. 2a – b + c

Answer 1

Combine (or subtract) like terms.

a + b – c + 3a – 2c

4a + b – 3c <-------------------Answer

So, Choice B.

Answer 2

For this case we have the following expression:

`(a + b + c) + 3a-2c`

We eliminate parentheses:

`a + b-c + 3a-2c =`

We add similar terms:

`a + 3a + b-c-2c =`

We have that equal signs are added and the same sign is placed, while different signs are subtracted and the sign of the major is placed, then:

`4a + b-3c`

Answer:

`4a + b-3c`

Option B