1.

Let →a=4^i+5^j−^k,→b=^i−4^j+5^k, and →c=3^i+^j−^k. Find a vector →d which is perpendicular to both →c and →b and →d.→a=21.

Answer»

Let a=4^i+5^j^k,b=^i4^j+5^k, and c=3^i+^j^k. Find a vector d which is perpendicular to both c and b and d.a=21.



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