jika a = i+2j+3k ; b = -3i-2j-k ; c = i-2j+3k, maka 2a + b - c adalah

Mapel : Matematika
Kelas : XII SMA
Bab : Vektor

Pembahasan :
2a + b - c
= 2[1 2 3] + [-3 -2 -1] - [1 -2 3]
= [2 4 6] + [-3 -2 -1] + [-1 2 -3]
= [(2 - 3 - 1) , (4 - 2 + 2) , (6 - 1 - 3)]
= [-2 , 4 , 2]
= -2i + 4j + 2k