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The dot product of the vector A = 3*i + 4*j + 5*k and B = -i + 2*j ?

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The dot product of the vector A = 3*i + 4*j + 5*k and B = -i + 2*j

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  1. A ● B = (3i + 4j + 5k) ● (-i + 2j)

    ==> 3i*(-i) + 4j*2j + 5k*0k

    ==> -3 + 8

    ==> 5

    Dot product is also called the scalar product, meaning you get a number back, not another vector.

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