If x - 1x - 13- then what is 9x2 - 9x2 equal to-

The correct option is B 19 Given, x 1x=13 Squaring both sides gives (x 1x )^2 = 19 ⇒ x^2 + 1x^2 2 = 19 ⇒ x^2 + 1x^2 = 2 + 19 = 199 ...

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Cube Numbers

If x - 1x =...

Question

If $x - \frac{1}{x} = \frac{1}{3}$ , then what is $9 x^{2} + \frac{9}{x^{2}}$ equal to?

18

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