Q17: Given: a = i + j + k, a. b = 1 and a × b = j - k. Then, b is equal to
A. -2i
B. 2i + k
C. 3j
D. i
how?
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Q17: Given: a = i + j + k, a. b = 1 and a × b = j - k. Then, b is equal to
A. -2i
B. 2i + k
C. 3j
D. i
how?
An idea might be to start by definingso that you can get expressions for
and
, which you then should be able to solve simultaneously for
...