Question

if x=√5+2,then find the value of x²+1/x²
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Answer 1

Answer:

let's first substitute the values of x=(√5+2)²+1/(√5+2)²

=√5²+4√5+2²=9+4√5

=1/(√5+2)²= 1/9+4√5

after rationalizing the denominator we will get,

9-4√5/1=9-4√5

now,

9+4√5+9-4√5= 18

tell me if this is correct