Question

If A vector = 2i^-3j^+7k^ and B vector=i^+2j^ and c vector =j^-k^.Find A vector . (BVector × c vector)​

Answer 1

A.(B×C)= (2i- 3j+7k).{(i+2k)×(j- k)}= (2i - 3j +7k).{i(-2-0)-j(-1-0)+k(1-0)}=(2i-3j +7k) . (-2i+j+k)= -4-3+7= -7+7=0

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