1.

If vec(a)= 4vec(i) + 5vec(j)- vec(k), vec(b)= vec(i)- 4vec(j) + 5vec(k) and vec(c )= 3vec(i) + vec(j)- vec(k), the find vector vec(alpha) which is perpendicular to both vec(a), vec(b) and vec(alpha).vec(c )= 21

Answer»


ANSWER :`7vec(i)-7vec(J)-7vec(K)`


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