If `vec(p)` is a unit and `(vec(x) - vec (p)) . (vec(x)+ vec (p)) = 80 ` then find `|vec(x)|`

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If `vec(p)` is a unit and `(vec(x) - vec (p)) . (vec(x)+ vec (p)) = 80 ` then find `|vec(x)|`
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