Examples of Math Problems
examples of math problems that I like, solved, etc.
Tuesday, August 13, 2013
show that the two vectors a = 9i + j - 4k, b = 3i - 7j + 5k are mutually perpendicular
Vectors are perpendicular if their dot product is 0:
(9)(3)+(1)(-7)+(-4)(5)=27-7-20=0
:)
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