Finding vector C from 3.00A−4.00B without knowing A or B

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Eats Dirt
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Homework Statement



use unit vectors to express the vector C where C=3.00A-4.00B
the answer is apparently C=12.0i + 14.9j

Homework Equations



cross product

The Attempt at a Solution



i have no idea where to even start how is it possible to find the i orj because i don't even know the components of A or B
 

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To find the unit vector you're going to have to divide each component of the vector by the magnitude of the vector.