+0  
 
0
746
2
avatar+4 

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
avatar+27128 
+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(22 + (-9)2 + (-1)2)  → sqrt(86) 

 

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

.

Alan  Oct 17, 2017
 #2
avatar+93866 
+1

Thanks Alan, :)

Melody  Oct 17, 2017

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