Question

If x + 1/x = 5, then x² + 1/x² = ? *​

Answer 1

Answer:

Step-by-step explanation:

x + 1/x = 5

//square on both sides

(x + 1/x)² = 5²

=> x² + 1/x² + 2(x)(1/x) = 25 (∵ (a +b)² = a² + b² + 2ab )

=> x² + 1/x² + 2 = 25

=> x² + 1/x² = 23.