2/7¡ + aj` +6/7k` represents a unit vector find tha value of a.
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So, magnitude of vector 2/7¡ + aj` +6/7k` should be 1.
=> √(2/7)^2 + a^2 + (6/7)^2.
4/49 + a^2 + 36/49 = 1
a^2 + 40/49 = 1
a^2 = 1- 40/49
a^2 = 49-40/49
a^2 = 9/49
Square root on both the sides:
a = √9/49
a= ± 3/7
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