Question

Add

3a − 2b + 5c, 2a + 5b − 7c, − a − b + c

Answer 1

Sum of the given expressions
 = (3a − 2b + 5c)+(2a + 5b − 7c)+ (− a − b + c)
Rearranging and collecting the like terms
= 3a+2a-a-2b+5b-b+5c-7c+c
= (3+2-1)a + (-2+5-1)b + (5-7+1)c
= 4a+2b-c