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VECTOR ALGEBRA — Maths STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceMathsVECTOR ALGEBRA1 Mark
Question
If $\vec{\text{p}}$ is a unit vector and $(\vec{\text{x}}-\vec{\text{p}})\cdot(\vec{\text{x}}+\vec{\text{p}})=80,$ then find $|\vec{\text{x}}|.$
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Answer

9.

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