tolong y kak, penting banget!!

vektor
P titik tenga AB-->  P =1/2 AB --> p=  1/2 (b+a)
Q titik tengah BC--> Q = 1/2 BC --> q = 1/2 (c+b)

PQ = q - p
PQ = 1/2 (c+b) - 1/2 (b+a)
PQ = 1/2 {c+-b - b - a )
PQ = 1/2 (c-a)

PQ = 1/2  (C - A)
PQ = 1/2 {(-2,0,1 - (6,4 -7)}
PQ = 1/2 {(-2-6). (0-4),(1+7)}
PQ = 1/2 {-8, -4, 8}
PQ = (-4, - 2, 4) = -4i - 2j + 4k