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Questions  >>  CBSE XII  >>  Math  >>  Vector Algebra
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Q)

Find $| \overrightarrow x |$, if for a unit vector $\overrightarrow a , (\overrightarrow x − \overrightarrow a) ⋅ (\overrightarrow x + \overrightarrow a) =12$.

$\begin{array}{1 1} (A) |\overrightarrow x|=\sqrt{11} \\ (B) |\overrightarrow x|=\sqrt{12} \\ (C) |\overrightarrow x|=\sqrt{13} \\ (D) |\overrightarrow x|=\sqrt{14} \end{array} $

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