1.

If \(\overrightarrow{p}\) is a unit vector and \((\overrightarrow{x}-\overrightarrow{p}).(\overrightarrow{x}+\overrightarrow{p})\) = 80 then the value of \(|\overrightarrow{x}|\) is(A) \(4\sqrt{5}\)(B) 7(C) 8(D) 9

Answer»

Correct option is: (D) 9



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