Question

solve the sum solve the sum​

Answer 1

x^2 - 2 + 1/x^2 -1

(x - 1/x ) ^2 - 1

(x - 1/x +1) (x - 1/x - 1)

Answer 2

f(×)=x2+1/x2-3

= x4+1-3x2/x2

Let f(x)=0

=x4-3x2+1=0

=x2(x2-3)+1=0

=x2-2=0

=x2-(√2)2=0

=(x-√2) (x+√2)=0

=x=+√2 or -√2