If vec a is a unit vector and (vec x - v...

If `vec a` is a unit vector and `(vec x - vec a).(vec x + vec a)=8`, then find `|vec x|`

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Given,
`(vec x - vec a).(vec x + vec a)=8`
`=>(vecx)^2 -(|veca|)^2` = 8
since `vec a` is a unit vector then `|veca|=1`
...

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