diketahui vektor u = 3i + 2j + k, v = 2i + j ,dan W = 3u- 4v, maka besar W adalah

W = 3(3,2-1) - 4(2,1,0)
W = (9,6,-3) - (8,4,0)
W = (1,2,-3)

besar W
= akar 1² + 2² +(-3)²
= akar (1+4+9)
= akar 14