Question

if X equals to 1 by root 5 minus 2 then the value of x square + 1 by x square is what ​

Answer 1

Answer: x²+1/x²=18

Step-by-step explanation:

x=1/√5-2

=√5+2/(√5)²-(2)²

=√5+2/5-4 = √5+2

x=1/√5-2

1/x=√5-2

x²+1/x² = (√5+2)²+(√5-2)²

=(5+4√5+4)+(5-4√5+4)

= 9+4√5+9-4√5 =18