Question

Прошу, хелп(((
1/х+х=4
Найдите х^2+1/х^2

Answer 1

1/х+х=4

(1/х+х)^2=4^2

1/x^2+2*1/x*x+x^2=16

1/x^2+2+x^2=16

1/x^2+x^2=14