Question

Add: a+b+c, a-b+c, -a+b+c, a+b+c​

Answer 1

Answer:

Step-by-step explanation:

(a+b+c)+( a-b+c)+(-a+b+c)+( a+b+c)​

= a+b+c+a-b+c-a+b+c+a+b+c

=a+a-a+a+b-b+b+b+c+c+c+c

=2a+2b+4c