Diketahui vektor a=(0,4,1) b=(-2,3,0) c=(4,4,0) ditanya besar panjang vektor |2a+b-c|

# 2a+b-c
= 2 (0,4,1) + (-2,3,0) - (4,4,0)
= (0,8,2) + (-2,3,0) - (4,4,0)
= (-6,7,2)
# |2a+b-c|
= √ (-6)² + 7² + 2²
= √ 36 + 49 + 4
= √89