+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
+33652 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)
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