Question

plz answer my Question plz plz send me fast

Answer 1

$x - \frac{1}{x} = - 1 \: \: (squaring \: both \: side) \\ ({x - \frac{1}{x} })^{2} = ( { - 1})^{2} \\ {x }^{2} + \frac{1}{x {}^{2} } - 2 \times x \times \frac{1}{x} = 1 \\ {x}^{2} + \frac{1}{ {x}^{2} } - 2 = 1 \\ {x}^{2} + \frac{1}{x {}^{2} } = 1 + 2 \\ {x }^{2} + \frac{1}{x {}^{2} } = 3$