Problem Compute the value of b if A and B are orthogonal. $${\bf A} = 2{\bf i} + b{\bf j} + {\bf k}$$
$${\bf B} = 4{\bf i} - 2{\bf j} - 2{\bf k}$$
Answer Key
Solution
$2(4) + b(-2) + 1(-2) = 0$
$2b = 6$
$b = 3$ ← Answer: [ D ]
Follow @iMATHalino
MATHalino