Question

ДАМ 40 БАЛОВ!!!
Номер 9

Answer 1

$x-\frac{1}{x} =2\\\\(x-\frac{1}{x})^{2} =2^{2}\\\\x^{2} -2*x*\frac{1}{x}+(\frac{1}{x})^{2}=4\\\\x^{2}-2+\frac{1}{x^{2}}=4\\\\x^{2} +\frac{1}{x^{2}}=4+2\\\\\boxed{x^{2}+\frac{1}{x^{2}}=6}$