let a and b two vectors such that vector a = 3i + 4j, and the magnitude of vector b = 4, where the angle between the given vectors is 60*. If the vector (m(vector a)+vector b) is perpendicular to vector b, find the value of m.

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I get it up to the point m(vector a) is m a scalar then?

yes

we can just say that Bv is <0,4> right? thats a vecotr of magnitude 4 :)

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