SOLUTION: show that the two vectors a = 9i + j - 4k, b = 3i - 7j + 5k are mutually perpendicular

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Question 740326: show that the two vectors a = 9i + j - 4k, b = 3i - 7j + 5k are mutually perpendicular
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
Vectors are perpendicular if their dot product is 0:
(9)(3)+(1)(-7)+(-4)(5)=27-7-20=0



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