Posted by grace on .
if U=i+3j2k and V=4i2j4k are vectors find U.V, 3U+V& (2U+V).(U2V) (a)6,10,4(b)4143(c)11,4,5(d)5,11,6

geometry 
Steve,
not sure what the alleged answers are supposed to mean, but
3U+V = 3+4,92,64 = 7i+7j10k
work the other linear combinations the same way, and for the dot product multiply pairs and add.
What results do you get?