vektor α = 2i + 3j +k, b= 3i - 2k dan c = 2j - 5k... Vektor a - 2b - 3c adalah.. jalanya yaaa...

a - 2b - 3c =
= (2 3 1) - 2 (3 0 -2) - 3 (0 2 -5)
= (2 3 1) - (6 0 -4) - (0 6 -15)
= (2-6-0) + (3-0-6) + (1+4+15)
= - 4 - 3 + 20
= 13