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-2.AP = 3.PB
-2(P - A) = 3.(B - P)
-2P + 2A = 3B - 3P
-2P + 3P = 3B - 2A
P = 3B - 2A
P = 3(5 4 10) - 2(1 0 2)
P = (15 12 30) - (2 0 4)
P = (13 12 26)
koordinat P(13,12,26)
|P|
= √(13² + 12² + 26²)
= √(169 + 144 + 676)
= √989
jadi panjang P = √989