geometry

posted by .

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?

Similar Questions

1. PreCalculus

Given vectors u=7i + 3j and v = -4i + 3j, find 5u-4v in terms of unit vectors. I am just beginning the study of vectors and have this problem. Could someone help?
2. Vectors and Geometry

if A=i+j, B=2i-3j+k and C=4j-3k find (i) (AxB)xC & Ax(BxC)
3. math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular
4. math

two vectors are defined as a=2i+xj and b=i-4j. find value of x if a) the vectors are parallel b) the vectors are perpendicular
5. math

given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the product of vectors p and q?
6. math

given that vectors(p+2q) and (5p-4q) are orthogonal,if vectors p and q are the unit vectors,find the dot product of vectors p and q?
7. math

if vectors a+b+c=0 and modulus of the vectors a, b and c are 3 ,5 and 7 respectively. find the angle between the vectors a and b.
8. vectors and geometry

Given that a = 5i +2j - k and b = I - 3j + k. Find (a + b) x (a + b).
9. vectors and geometry

Find the scalar product a.b. If a = 2i + 3j + 4k and b = 5i - 2j + k
10. Physics

Please help me with this its very hard to visualize the problem. The analytical method of adding vectors expressed in terms of their components may be applied to vectors in three dimensions, for which graphical work is inconvenient. …

More Similar Questions

Post a New Question