Jika vektor a = 3i – 3j + 2k dan vektor b = 2i + j + 3k. Tentukan vektor a + b dan vektor a – b = ….

Jika vektor a = 3i – 3j + 2k dan vektor b = 2i + j + 3k. Tentukan vektor a + b  dan vektor a – b = ….

Jawab:

a + b = 3i – 3j + 2k + 2i + j + 3k

         = (3 + 2)i + (-3 + 1)j + (2 + 3)k

a + b = 5i – 2j + 5k

a – b = 3i – 3j + 2k – (2i + j + 3k)

         = (3 – 2)i + (-3 – 1)j + (2 – 3 )k

a – b = i – 4j – k