Question 1132125
<br>
Treat the vector components just like variables.<br>
a=2i+3j-k,
b=i-j+2k,
c=3i+4j+k.<br>
a+2b-c =
(2i+3j-k)+2(i-j+2k)-(3i+4j+k) =
(2+2-3)i + (3-2-4)j + (-1+4-1)k =
i-3j+2k<br>