Question

помогите пожалуйста

Answer 1

$x+ frac{1}{x} =3\\(x+ frac{1}{x} )^2=9\\x^2+2+ frac{1}{x^2}=9\\x^2+ frac{1}{x^2} =7\\(x^2+ frac{1}{x^2})^2=49\\x^4+2+ frac{1}{x^4} =49\\x^4+ frac{1}{x^4} =47$