Question

The vector joining the points A (1,1,-1) and B (2, -3, 4) and pointing from A to B is -
(A) - 1 + 4 j – 5k (B) i + 4 ] + 5k (C) i - 4 j+ 5k (D) - 1i-4j-5k
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Answer 1

Answer:

vec AB=Pos vect of B-Pos vec of A

=(2i-3j+4k)-(i+j-k)=i-4j+5k

hence option (C) is correct