11 Given the vectors M = ax 4ay − 8az and N = 8ax 7ay − 2az, find
a) a unit vector in the direction of −M 2N
−M 2N = 10ax − 4ay 8az 16ax 14ay − 4az = (26, 10, 4)
Thus
a =
(26, 10, 4)
|(26, 10, 4)|
= (092, 036, 014)
b) the magnitude of 5ax N− 3M
(5, 0, 0) (8, 7,) − (, 12,) = (43,, 22), a..