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geometry

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if U=i+3j-2k and V=4i-2j-4k are vectors find U.V, 3U+V& (2U+V).(U-2V) (a)6,10,4(b)4143(c)11,4,5(d)5,11,6

  • geometry - ,

    not sure what the alleged answers are supposed to mean, but

    3U+V = 3+4,9-2,-6-4 = 7i+7j-10k

    work the other linear combinations the same way, and for the dot product multiply pairs and add.

    What results do you get?

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