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Cara penulisan vector bisa juga begini: [a, b] bukan kurung koordinat biasa (...)
Tentu saat penulisan biasa di kertas, tetap menulis dalam bentuk kolom vertikal seperti di foto soalnya
OA = [2, - 1]
OB = [- 1, 4]
OC = [3, 2]
AB = OB - OA
= [- 1, 4] - [2, - 1]
= [- 3, 5]
AC = OC - OA
= [3, 2] - [2, - 1]
= [1, 3]
BC = OC - OB
= [3, 2] - [- 1, 4]
= [4, - 2]
BA = OA - OB
= [2, - 1] - [- 1, 4]
= [3, - 5]
CA = OA - OC
= [2, - 1] - [3, 2]
= [- 1, - 3]