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Question
Which of the following are quadratic equation in x?
`x^2-1/x^2=5`
Solution
`x^2-1/x^2=5x^2`
`⇒x^4-1=5x^2`
`⇒x^4-5x^2-1=0`
`(x^4-5x^2-1)`is a polynomial with degree 4.
∴` x^2-5x^2-1=0` is not a quadratic equation
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