Diketahui titik a(-1, 2, 7), b(2, 1, 4) dan c(6, -3, 2). apabila vektor ab = u dan vektor bc = v, tentukan hasil dari u . v !

ab = u

b – a = u

(2, 1, 4) – (-1, 2, 7) = u

(3, -1, -3) = u

u = (3, –1, –3)

bc = v

c – b = v

(6, -3, 2) – (2, 1, 4) = v

(4, -4, -2) = v

v = (4, –4, –2)

u . v = (3, -1, -3) . (4, -4, -2)

= 12 + 4 + 6

= 22