The Student Room Group

Triple vetor products as a linear combination

State (but do not prove) a formula that expresses the triple vector product p (q r)
as a linear combination of the vectors q and r .
Also, Suppose a , b and c are non-zero vectors such that a b = a c = 0 . Show that it is
always possible to find vectors x and y for which a x = b , a y = c , and x y = 0 .
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