Vectors

if |x|=2 and |y|=5, determine the dot product between x-2y and x+3y if the angle between vector x and y is 60deg.

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  1. say X = 2 i + 0 j
    Y = 5 cos 60 i + 5 sin 60 j
    Y = 2.5 i + 4.33 j

    then
    X - 2Y = -3 i - 8.66 j
    X + 3Y = etc, I think you can do it from there

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