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Dit : panjang u
Peny:
⇒ u= a + 2b - c
⇒ u = (2i - j + 3k) + 2 (3i + 2j - k) - (4i - 3j + k)
⇒ u = (2i - j + 3k) + (6i + 4j - 2k) - (4i - 3j + k)
⇒ u = 4i + 6j
maka :
panjang U =
⇒
⇒√52
⇒ √ 4 x 13
⇒2√13
jadi jawabannya D. 2√13