find a.b if a= 2i-3j+k and b=i +2j-3k
aishwaryashree3:
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Answers
Answered by
7
Answer:
a.b = - 7
Step-by-step explanation:
a.b = (2i*i) + (-3j*2j) + (k*-3k)
a.b = 2-6-3
a.b = -7
thank you
Answered by
8
it is vectors dot product i×i=0
(2i-3j+k)(i+2j-3k). j×j=0
2i.i-3j.2j-k.3k
2-6-3. k×k=0
2-9=-7
therefore -7 is the answer
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