Asked by poppy
find the triple product of (A*B).C given that A =i + 4j, B=2i - 3j and C = i + k?
Answers
Answered by
oobleck
Recall that A•B×C =
|a1 a2 a3|
|b1 b2 b3|
|c1 c2 c3|
Now, since u•v = v•u, A×B•C = C•A×B =
|1 0 1|
|1 4 0| = -11
|2 -3 0|
|a1 a2 a3|
|b1 b2 b3|
|c1 c2 c3|
Now, since u•v = v•u, A×B•C = C•A×B =
|1 0 1|
|1 4 0| = -11
|2 -3 0|
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