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Roots of Quadratic Equation

Check whether...

Question

Check whether the following equation is quadratic or not
$x^{2} + \frac{1}{x^{2}} = 5$

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Solution

$x^{2} + \frac{1}{x^{2}} = 5 \frac{x^{4} + 1}{x^{2}} = 5 x^{4} + 1 = 5 x^{2} x^{4} - 5 x^{2} + 1 = 0$
It is not of the form ${a x}^{2} + b x + c = 0$
Therefore,the given equation is not a quadratic equation.

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