whos able to answer this question challenging

a = 21 - 6j + k

b = -3j -2k

the unit vector Ĉ of the vector c where c = a + b

adotmaths
Oct 17, 2017

#1**+2 **

I assume a is meant to be: a = 2i - 6j + k

with b = -3j - 2k

To add them you just add corresponding coefficients of i, j and k to get:

c = 2i - 9j - k

To get the unit vector in this direction divide each coefficient by the size of c

|c| = sqrt(2^{2} + (-9)^{2} + (-1)^{2}) → sqrt(86)

c = (2i - 9j - k)/sqrt(86)

.

Alan
Oct 17, 2017