Ask a New Question

Question

If a is a unit vector Ibl = 5 and la + b1 = square root17. determine (-4a - 3b) • (b + 7a)
3 years ago

Answers

oobleck
|a| = 1
|b| = 5
|a+b| = √17
(-4a - 3b) • (7a + b) = -28a•a - 25a•b - 3b•b
= -28 - 15 - 25a•b
= -43 - 25a•b
See what you can do with that, and the definition of a•b
3 years ago

Related Questions

If I have a unit vector of (2.06 j)m/s(I have no i vector because it's 0 on a horizontal impulsion,... Find a unit vector in the direction of v = (1,-1). Write your answer as a linear combination of t... What is the unit vector in R^2 which makes an angle of π4 with both the x- and y-axes? If vector a & vector b are unit vectors ,then what is the angle between vector a & vector b so that... What is the unit vector of v: <-6, -8>? If u and v are both unit vectors that make an angle of 60 degrees to each other, calculate a) |2u+3... What is the unit vector in the direction of vector P=2i+3j-5k What is a unit vector in the direction of the resultant of vectors A = 2i-3j+k , B = i+j+2k and C =...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use