Practicing Success
If $x (5-\frac{2}{x})=\frac{5}{x}$, then the value of $x^2 +\frac{1}{x^2}$ is equal to : |
$2\frac{4}{25}$ $2\frac{1}{25}$ $\frac{4}{25}$ $2\frac{3}{25}$ |
$2\frac{4}{25}$ |
If $x (5-\frac{2}{x})=\frac{5}{x}$, then, 5x - \(\frac{5}{x}\) = 2 Squaring on both the sides, 25x2 + \(\frac{25}{x^2}\) = 4 + 2×25 = 25x2 + \(\frac{25}{x^2}\) = 54 Divide the equation by 25 on the both sides, then the value of $x^2 +\frac{1}{x^2}$ = \(\frac{54}{25}\) = $2\frac{4}{25}$ |