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If "x"+1/"x"=3, then "x"^2+1/"x"^2 will be - Mathematics

MCQ

If `"x"+1/"x"=3`, then `"x"^2+1/"x"^2` will be

Options

  • 9

  • 10

  • 27

  • 7

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Solution

7

Explanation:

`"x"+1/"x"=3`

Squaring both side

`"x"^2+1/"x"^2+2=9`

`"x"^2+1/"x"^2=7`

Concept: Number System (Entrance Exam)
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