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B = 4i - 4j + 4 k
ditanya : A · B = .... ?
dijawab : A · B = (4i - 6j -10k) · (4i - 4j + 4 k)
= 4 . 4 + (-6) . (-4) + (-10) . 4
= 16 + 24 - 40
A · B = 0