Question

please tell me the anwer​

Answer 1

Answer:

Step-by-step explanation:

We know that,

(a+ b)² = a²+2ab+b²

Let a=x and b=1/x

(x+1/x)² = x² + 2(x)(1/x) +(1/x)²

Substituting x+1/x = 3 in LHS,

(3)² = x² + 1/x²

x²+1/x² = 9