Question

se x+1/x = 10, calcule x²+ 1/x²​

Answer 1

x + 1/x = 10

(x + 1/x)² = (10)²

x² + 2.x.1/x + 1/x² = 100

x² + 2 + 1/x² = 100

x² + 1/x² = 100 - 2

x² + 1/x² = 98 ✓