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B = (1, -2, 1)
C = (7,(p - 1), -5)
panjang AB = B - A
= (1, -2, 1) - (3, 2, -1)
= (-2, -4, 2)
panjang BC = C - B
= (7, (p - 1), -5) - (1, -2, 1)
= (6, (p + 1), -6)
kita cari konstanta yang mengubah (-2, -4, 2) menjadi (6, (p + 1), -6)
misal kita ambil vektor dari sumbu x
-2 * x = 6
x = 6 / -2
x = -3
maka,
-4 * x = (p + 1)
-4 * -3 = p + 1
12 = p + 1
p = 12 - 1
p = 11
---> B.